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1. The total age of A, B and C is 90 years. Ten years ago the ratio of their ages was 1 : 2 : 3. What is the present age of B?
- A. 40 years
- B. 40 years
- C. 40 years
- D. 40 years
Answer: Option B
Explanation:
ধরি, 10 বছর আগে এদের বয়স ছিলো x, 2x, 3x
x + 10 + 2x + 10 + 3x + 10 = 90
6x + 30 = 90
6x = 90 - 30
6x = 60
x = 10
B's present age = (2x + 10) = 30 years
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