The ratio between the present ages of A and B is 7:2 and their difference of ages is 15 years. What is present age of B ?
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Answer:
7x-2x=15
5x=15
x=15/5
x=3
Present ages o A and B both
A=7x=7×3=21
B=2x=2×3=6
Answer is present age of B which is 6
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