一条英语数学题Johnny bought some foods in a supermarket.Johnny paid

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一条英语数学题
Johnny bought some foods in a supermarket.Johnny paid $41 for 6packs of biscuits and 2 bags of potato chips.If $11.5 is needed for 1 pack of biscuits and 1bag of potato chips,what are the price of a pack of biscuits and the price of a bag of potato chips.

X:1 pack of biscuits' price Y:1 pack of potato chips' price
6X+2Y=41
X+Y=11.5
Solve it :X=4.5 Y=7

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