Question : Directions: What will come in the place of the question mark (?) in the following equation if + and – are interchanged and × and ÷ are interchanged? 40 × 10 − 20 + 10 ÷ 2 = ?
Option 1: 4
Option 2: 8
Option 3: 6
Option 4: 2
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Correct Answer: 4
Solution : Given: 40 × 10 − 20 + 10 ÷ 2 = ?
Interchange the mathematical signs of the equation according to the instructions given – = 40 ÷ 10 + 20 – 10 × 2 = 4 + 20 – 10 × 2 = 4 + 20 – 20 = 4
So, 4 is the required answer. Hence, the first option is correct.
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