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J : M : T => 6 : 5 :11

Constantant total. The question requires 3 units or multiple of 3 units working since it says Mary is half of Jim in the end. We will times 3 to the ratio.

J : M : T => 18u : 15u : 33u => at first

J : M : T => 22u : 11u : 33u => In the end, this is why the total needs to be in mulitple of 3

Mary gave = 15u – 11u = 4u
4u = 12
u = 3

At first Mary had 15u = 15 X 3 = 45 stamps ##

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