Both Xiao Ming and xiao gang like to collect stamps. Now the ratio of the number of stamps between them is 8:7. If Xiao Gang gives Xiao Ming 8 stamps, they will get 8 stamps Both Xiao Ming and Xiao Gang are fond of collecting stamps. Now the ratio of the number of stamps of Xiao Ming and Xiao Gang is 3:4. If Xiao Gang gives Xiao Ming 9 stamps, the ratio of their stamps is 4:5. How many stamps have they collected?

Let Xiaoming have 3K stamps and Xiaogang have 4K stamps
(3k+9)/(4k-9)=4/5
The solution is k = 81
Xiaoming has stamps: 3 × 81 = 243
Xiaogang has stamps: 4 × 81 = 324

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