number = x + y +
revenue = 500 x + 600 y + 900 z
I can not say how much they cost because you said how much they were sold for, not how much they cost the shop. I suspect you mean the total revenue, how much the shoppers paid the store.
A shop sells x books at 500 each y at 600 each, and z books at 900 each. how many books are sold altogether? How much did all the books cost?
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I am sorry that this is wrong in my idea please take it easy
Me don't know
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