One-piece 6233

If we take six pieces, we will pay only for four. One-piece cost 7, and my mother bought 31 pieces. How much did she pay for the purchase?

Correct answer:

x =  147

Step-by-step explanation:

a=31/6=5 b=316 a=316 5=1  x=7 (4 a+b)=7 (4 5+1)=147

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