Five years ago, the ratio of ages of P and Q was 3:2. Ten years from now, the ratio of their ages will be 6:5. What is P's age at present?
Choose the correct choice from the following answers:  A) 20  B) 25  C) 30  D) 35  E) 40
2(P-5)/3 = (Q-5). Then Q = 2(P-5)/3 + 5   5(P+10)/6 = Q+10   5(P+10)/6 = 2(P-5)/3 +15   5P+50 = 4P + 70   P = 20   The answer is 20.
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Five years ago, the ratio of ages of P and Q was 3:2. Ten years from now, the ratio of their ages will be 6:5. What is P's age at present?