the ratio of the ages of two boys is 3:4. After 3 years, the ratio will be 4:5. The ratio of their ages after 21 years will be:-
(A) 14:17 (B) 17:19
(C) 11:12
(D) 10:11
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The answer is option (D) 10:11
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their present ages will be 9 and 12 ..so after 21 years rario of their ages will be 30：33 ......10：11
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