Question
Download Solution PDFWhich two signs and two numbers should be interchanged in the following equation to make it correct?
60 × 3 + 660 ÷ 6 – 20 = 290
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
60 × 3 + 660 ÷ 6 – 20 = 290
Calculation:
By option Method:
Option 1: exchange 6 and 660, × and ÷
⇒ 60 ÷ 3 + 6 x 660 – 20 = 290
⇒ 20 + 3960 - 20 = 290
⇒ 3960 ≠ 290
This is not correct the equation.
Option 2: exchange 20 and 6, + and -
⇒ 60 × 3 - 660 ÷ 20 + 6 = 290
⇒ 180 - 33 + 6 = 290
⇒ 153 ≠ 290
This is not correct the equation.
Option 3: exchange 20 and 60, + and ×
⇒ 20 + 3 x 660 ÷ 6 – 60 = 290
⇒ 20 + 330 -60 = 290
⇒ 290 = 290
This is correct the equation.
Option 4: exchange 20 and 660, + and ÷
⇒ 60 × 3 ÷ 20 + 6 – 660 = 290
⇒ 9 + 6 - 660 = 290
⇒ -645 ≠ 290
This is not correct the equation.
Hence, 'Option 3' is the correct answer.
Last updated on Jul 12, 2025
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