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Joseph gave 1/4 of his stamps to joy, then Joy gave 1/5 of what she received to Tom. If  Tom received 4 stamps, 
how many stamps had Joseph originally?
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Solution
If Tom received 4 stamps, it means that Joy received 5*4 = 20 stamps, according to the condition.
In turn, it means that Joseph had 4*20 = 80 stamps originally.
Solved, explained and completed.