Thank you very much.

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Thankyouverymuch.Thankyouverymuch. Thankyouverymuch.设2元的人数为X,5元的为Y,列方程:X+Y=55-1-102X+5Y=274-1×6

Thank you very much.
Thank you very much.
 

Thank you very much.
设2元的人数为X,5元的为Y,列方程:X+Y=55-1-10 2X+5Y=274-1×6-10×7