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Xiao Hong has three more stamps than Xiao Li. If Xiao Hong gives Xiao Li three more stamps, whose stamps are more and how many more?
Let Xiaohong have X stamps, Xiaoli x-3, Xiaohong x-3, Xiaoli x-3 + 3 = x, x-3
Xiao Li has 420 stamps, two fifths more than Xiao Hong's. how many more stamps does Xiao Li have than Xiao Hong?
420÷（1+2/5）×2/5
=300×2/5
=120 (sheet)
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