Question : Directions: What will come in the place of the question mark (?) in the following equation if + and – are interchanged and × and ÷ are interchanged?
42 × 7 ÷ 12 – 77 + 13 = ?
Option 1: 140
Option 2: 131
Option 3: 136
Option 4: 134
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Correct Answer: 136
Solution :
Given:
42 × 7 ÷ 12 – 77 + 13 = ?
If + and – are interchanged and × and ÷ are interchanged then the equation will be as follows –
= 42 ÷ 7 × 12 + 77 – 13
= 6 × 12 + 77 – 13
= 72 + 77 – 13
= 149 – 13
= 136
Here, only the third option satisfies the given equation. Hence, the third option is correct.
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