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Mr McKay bought b boxes of crackers for $3 each and p pounds of cheese for $4 per pound. How much did he spend in all.

User Milo
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In normal circumstances, you would multiply the amount of boxes by 3, and the amount of pounds by 4. So you do the same here:
3b + 4p

Mr McKay spent 3b + 4b in total
User Fixpoint
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