Y is four times as old as X. After 6 years, the sum of half of X's age and a fourth of Y's age will be the same as three times the present age of X. How old will X be after 6 years?
A. 3
B. 9
C. 10
D. 12
E. 15
সঠিক উত্তরঃ
B.
9
Explanation:
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