Question : Directions: Which two numbers should be interchanged to make the given equation correct? 15 – 24 + 63 ÷ 7 × 2 = 9
Option 1: 63 and 9
Option 2: 7 and 63
Option 3: 24 and 9
Option 4: 63 and 24
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Correct Answer: 24 and 9
Solution : Given: 15 – 24 + 63 ÷ 7 × 2 = 9
According to the given options interchange the numbers. First option: 63 and 9 15 – 24 + 63 ÷ 7 × 2 = 9 Solving the L.H.S. of the equation – 15 – 24 + 9 × 2 15 – 24 + 18 6 ≠ 9 Second option: 7 and 63 15 – 24 + 7 ÷ 63 × 2 = 9 Solving the L.H.S. of the equation – 15 – 24 + 0.222 –8.778 ≠ 9 Third option: 24 and 9 15 – 9 + 63 ÷ 7 × 2 = 24 Solving the L.H.S. of the equation – 15 – 9 + 9 × 2 = 24 15 – 9 +18 = 24 24 = 24 (L.H.S. = R.H.S) Fourth option: 63 and 24 Solving the L.H.S. of the equation – 15 – 63 + 24 ÷ 7 × 2 = 9 15 – 63 + 6.85 –41.14 ≠ 9
So, 24 and 9 are interchanged numbers to make the equation correct. Hence, the third option is correct.
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