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 : +, ×, ÷
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RRB NTPC Graduate Level Full Test - 01
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Detailed Solution

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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 ‘+, ×, ÷’.

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