Testbook Logo
Exams SuperCoaching Test Series Skill Academy
More
English
Hindi
Telugu
Bengali
Marathi
Malayalam
Tamil

Question

Download Solution PDF

In the following question, by using which of the following mathematical operators will the expression become correct?

12_16_15_8 = 42

  1. ×, –, +
  2. +, ×, ÷
  3. ÷, +, ×
  4. +, +, –

Answer (Detailed Solution Below)

Option 2 : +, ×, ÷
Free Tests
View all Free tests >
Free
RRB NTPC Graduate Level Full Test - 01
2.4 Lakh Users
100 Questions 100 Marks 90 Mins
Start Now

Detailed Solution

Download Solution PDF

Using BODMAS rule:

1) ×, –, + ⇒ 12 × 16 – 15 + 8 = 185

2) +, ×, ÷ ⇒ 12 + 16 × 15 ÷ 8 = 42

3) ÷, +, × ⇒ 12 ÷ 16 + 15 × 8 = 120.75

4) +, +, – ⇒ 12 + 16 + 15 – 8 = 35

Hence, the correct set of symbols is ‘+, ×, ÷’.

Download Solution PDF
Latest RRB NTPC Updates

Last updated on Jul 17, 2025

-> RRB NTPC Under Graduate Exam Date 2025 has been released on the official website of the Railway Recruitment Board.

-> The RRB NTPC Admit Card will be released on its official website for RRB NTPC Under Graduate Exam 2025.

-> UGC NET Result 2025 out @ugcnet.nta.ac.in

-> HSSC CET Admit Card 2025 has been released @hssc.gov.in

-> Candidates who will appear for the RRB NTPC Exam can check their RRB NTPC Time Table 2025 from here. 

-> The RRB NTPC 2025 Notification released for a total of 11558 vacancies. A total of 3445 Vacancies have been announced for Undergraduate posts like Commercial Cum Ticket Clerk, Accounts Clerk Cum Typist, Junior Clerk cum Typist & Trains Clerk.

-> A total of 8114 vacancies are announced for Graduate-level posts in the Non-Technical Popular Categories (NTPC) such as Junior Clerk cum Typist, Accounts Clerk cum Typist, Station Master, etc.

-> Prepare for the exam using RRB NTPC Previous Year Papers.

-> Get detailed subject-wise UGC NET Exam Analysis 2025 and UGC NET Question Paper 2025 for shift 1 (25 June) here

->Bihar Police Driver Vacancy 2025 has been released @csbc.bihar.gov.in.

More Logical Puzzle Questions

Q1.If '−' means '÷', '÷' means '×', '×' means '+' and '+' means '−', then what will come in place of the question mark (?) in the following equation? 5 × 39 ÷ 1407 − 3 + 11562 = ?
Q2.What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged? 36 ÷ 15 − 175 × 5 + 11 =?
Q3.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘–’ are interchanged, and ‘×’ and ‘÷’ are interchanged?  43 + 15 ÷ 2 – 12 × 4 = ?
Q4.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?  8 ÷ 7 + 56 × 14 − 2 = ?
Q5. If '−' means '÷', '÷' means '×', '×' means '+' and '+' means '−', then what will come in place of the question mark (?) in the following equation? 9 ÷ 12 × 450 + 8208 − 18 = ?
Q6.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’  are interchanged and ‘×’ and ‘÷’ are interchanged? 52 ÷ 15 − 189 × 9 + 117 = ?
Q7. If ‘A’ stands for ‘×’, ‘B’ stands for ‘−’, ‘C’ stands for ‘+’, and ‘D’ stands for ‘÷’, then the  resultant of which of the following will be 9?
Q8. If '−' means '÷', '÷' means '×', '×' means '+' and '+' means '−', then what will come in place of the question mark (?) in the following equation?  1568 − 16 + 4 ÷ 5 × 22 = ?
Q9.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−‘ are interchanged and ‘×’ and ‘÷’ are interchanged? 66 ÷ 8 − 231 × 11 + 14 = ?
Q10.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘–’ are interchanged, and ‘×’ and ‘÷’ are interchanged? 56 – 12 × 4 ÷ 9 + 5 = ?

More Puzzle Questions

Q1.M, N, O, P, Y and Z live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6. Only M lives above N. Z lives immediately below N. Only P lives below O. Who lives on floor numbered 3?
Q2.A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6. The product of floors on which F and D live is 15. E lives immediately above C .The sum of floors on which A and D live is 7. What is the sum of floors on which A and E live?
Q3.If '−' means '÷', '÷' means '×', '×' means '+' and '+' means '−', then what will come in place of the question mark (?) in the following equation? 5 × 39 ÷ 1407 − 3 + 11562 = ?
Q4.What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged? 36 ÷ 15 − 175 × 5 + 11 =?
Q5.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘–’ are interchanged, and ‘×’ and ‘÷’ are interchanged?  43 + 15 ÷ 2 – 12 × 4 = ?
Q6.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?  8 ÷ 7 + 56 × 14 − 2 = ?
Q7.Seven boxes, A, B, C, D, E, F and G, are kept one over the other but not necessarily in the same order. C is kept immediately above F. G is kept immediately above B. Only E is kept above D. Only two boxes are kept above C. G is not kept in third position from the bottom. How many boxes are kept above G?
Q8. If '−' means '÷', '÷' means '×', '×' means '+' and '+' means '−', then what will come in place of the question mark (?) in the following equation? 9 ÷ 12 × 450 + 8208 − 18 = ?
Q9.What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’  are interchanged and ‘×’ and ‘÷’ are interchanged? 52 ÷ 15 − 189 × 9 + 117 = ?
Q10. If ‘A’ stands for ‘×’, ‘B’ stands for ‘−’, ‘C’ stands for ‘+’, and ‘D’ stands for ‘÷’, then the  resultant of which of the following will be 9?
Crack Super Pass Live with
India's Super Teachers
Explore Supercoaching For FREE
Suggested Test Series
View All >
RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2)
2341 Total Tests with 3 Free Tests
Start Free Test
Current Affairs (CA) 2025 Mega Pack for SSC/Railways/State Exam Mock Test
431 Total Tests with   1 Free Tests
Start Free Test
Suggested Exams
Exam-Logo
RRB NTPC

RRB NTPC Important Links

More Logical Reasoning Questions

Q1.M, N, O, P, Y and Z live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6. Only M lives above N. Z lives immediately below N. Only P lives below O. Who lives on floor numbered 3?
Q2.A, B, C, D, E and F live on six different floors of the same building. The lowermost floor in the building is numbered 1, the floor above it, number 2 and so on till the topmost floor is numbered 6. The product of floors on which F and D live is 15. E lives immediately above C .The sum of floors on which A and D live is 7. What is the sum of floors on which A and E live?
Q3.Refer to the following letter and symbol series and answer the question that follows. Counting to be done from left to right only. (Left) 7 * £ 5 8 $ 7 3 * 9 & % 4 6 @ 9 # 1 & 3 Ω (Right)  How many such symbols are there each of which is immediately preceded by a symbol and also immediately followed by a number?
Q4.Select the number from among the given options that can replace the question mark (?) in the following series. 29 33 41 53 ? 89 113
Q5.In a certain code language, ‘FUSE’ is coded as ‘3517’ and ‘SING’ is coded as ‘2458’. What is the code for ‘S’ in the given code language?
Q6.F, G, H, I, J, K and X are sitting around a circular table facing the centre of the table. H sits to the immediate right of F. Only three people sit between H and G when counted from the left of H. X sits third to the right of F. I sits to the immediate right of K. How many people sit between J and K when counted from the left of K?
Q7.If 1 is added to each odd digit and 2 is subtracted from each even digit in the number 5673128, what will be the difference between the digits which are third from the left and second from the right in the new number thus formed?
Q8.Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only. (Left) 4 6 & 8 $ 7 & 3 9 # % 4 6 @ £ 5 Ω 9 # 1 * 7 (Right) How many such numbers are there each of which is immediately preceded by a symbol and also immediately followed by another number?
Q9.What should come in place of the question mark (?) in the given series based on the English alphabetical order? NTZ LRX JPV HNT ?
Q10.Prakesh starts from point A and drives 11 km towards the south. He then takes a right turn, drives 7 km, turns right and drives 13 km. He then takes a right turn and drives 9 km. He takes a final right turn, drives 2 km and stops at point P. How far (shortest distance) and towards which direction should he drive in order to reach point A again? (All turns are 90 degree turns only unless specified.)
Exams
Cut Off
Eligibility
Coaching
Previous Year Papers
Syllabus
Test Series
Important Exams
Super Coaching
Testbook USA SAT Exam
Testbook USA ACT Exam
US College Admissions Guide
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
[email protected]
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Our Apps
Follow us on
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Get Free Access Now
Hot Links： teen patti casino teen patti chart teen patti app teen patti cash game