The number of stamps that P and Q had were in the ratio of 7:4 respectively. After P gave Q 8 stamps, the ratio of the number of P's stamps to the number of Q's stamps was 6:5. As a result of the gift, P had how many more stamps than Q?  Pick one: A) 4 B) 8 C) 12 D) 16 E) 20
P started with 7k stamps and Q started with 4k stamps.   (7k-8)/(4k+8) = 6/5   35k - 24k = 48 + 40   11k = 88   k = 8   P has 7(8) - 8 = 48 stamps and Q has 4(8)+8 = 40 stamps.   The answer is 8.
<result>B</result>
The number of stamps that P and Q had were in the ratio of 7:4 respectively. After P gave Q 8 stamps, the ratio of the number of P's stamps to the number of Q's stamps was 6:5. As a result of the gift, P had how many more stamps than Q?