Question 3
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The present ages of A and B are in the ratio 4 : 7, written as 4k and 7k in the grid. In 8 years the ratio will be 5 : 8.
How old is B now?
- A 56 Correct
- B 32
- C 64
- D 40
Correct Answer: Option A
(4k + 8) ÷ (7k + 8) = 5 ÷ 8
32k + 64 = 35k + 40 → k = 8
B = 7 × 8 = 56 (A = 32)
Trap: 32 is A’s age.
Answer: 56
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