Callum and Isobel have a total of 240 stamps. The ratio of the number of Callum’s stamps to the number of Isabel’s stamps is 3:8. Callum buys some stamps from Isabel. The ratio of the number of Caullum’s

Callum and Isobel have a total of 240 stamps.

The ratio of the number of Callum’s stamps to the number of Isabel’s stamps is 3:8.
Callum buys some stamps from Isabel.
The ratio of the number of Caullum’s stamps to the number of Isabel’s stamps is now 3:2
How many stamps does Callum buy from Isabel?
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