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
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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