Question
Perry tied some stamps into 10 bundles of 4 stamps each. After he bought another 30 stamps, he decided to tie them into bundles of 10 instead. How many bundles did he have in the end?
4 m

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Perry tied some stamps into 10 bundles of 4 stamps each. After he bought another 30 stamps, he decided to tie them into bundles of 10 instead. How many bundles did he have in the end?