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In 10 years, A will be twice as old as B was 10 years ago.
Question 1:
In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is :
A.
19
B.
29
C.
39
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Let B's present age = x years. Then, A's present age = (x + 9) years.
(x + 9) + 10 = 2(x - 10)
x + 19 = 2x - 20
x =39.
D.
49
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