Question : Directions: Which two numbers should be interchanged to make the given equation correct? 4 × 2 – 3 + 5 = 7
Option 1: 3 and 4
Option 2: 4 and 5
Option 3: 7 and 5
Option 4: 2 and 7
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Correct Answer: 3 and 4
Solution : Given: 4 × 2 – 3 + 5 = 7
Let's check the options – First option: 3 and 4 3 × 2 – 4 + 5 = 7 6 – 4 + 5 = 7 7 = 7 (L.H.S. = R.H.S.) Second option: 4 and 5 5 × 2 – 3 + 4 = 7 10 – 3 + 4 = 7 11 ≠ 7 Third option: 7 and 5 4 × 2 – 3 + 7 = 5 8 – 3 + 7 = 5 12 ≠ 7 Fourth option: 2 and 7 4 × 7 – 3 + 5 = 2 28 – 3 + 5 = 2 30 ≠ 2
So, by interchanging 3 and 4 equation becomes equal. Hence, the first option is correct.
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