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7 is added to a certain number; the sum is multiplied by 5; the product is divided by 9 and 3 is subtracted from the quotient. Thus if the remainder left is 12, what was the original number ?
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- 30
- 20
- 40
- 60
Correct Option: B
Check through options
20 → 20 + 7 = 27 → 27 × 5
= 135 → 135 ÷ 9
= 15 → 15 – 3 = 12
OR, We will solve the problem from the opposite side.
Here the remainder is 12.
12 + 3 = 15
15 × 9 = 135
135 ÷ 5 = 27
27 – 7 = 20
∴ The original number was 20.
