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7.
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A
is two years older than B who is twice as old as C. If the total of the ages
of A, B and C be 27, the how old is B?
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Answer: Option D
Explanation:
Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.
(2x + 2) + 2x + x = 27
5x = 25
x = 5.
Hence, B's age = 2x = 10 years.