The number of stamps that P and Q had were in the ratio of 7:3 respectively. After P gave Q 13 stamps, the ratio of the number of P's stamps to the number of Q's stamps was 5:4. As a result of the gift, P had how many more stamps than Q?	Select the correct option: A) 10 B) 25 C) 40 D) 65 E) 90
P started with 7k stamps and Q started with 3k stamps.   (7k-13)/(3k+13) = 5/4   28k - 15k = 117   k = 9   P has 7(9) - 13 = 50 stamps and Q has 3(9)+13 = 40 stamps.   The answer is 10.
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The number of stamps that P and Q had were in the ratio of 7:3 respectively. After P gave Q 13 stamps, the ratio of the number of P's stamps to the number of Q's stamps was 5:4. As a result of the gift, P had how many more stamps than Q?