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Mathematics 9 Online
OpenStudy (elisuzsmith):

A snack of an apple, a brownie, and a cheese stick has 270 calories. Two brownies and an apple have 290 calories. Two apples and three cheese sticks have 420 calories. How many calories are in each item? Let a 5 calories in an apple, b 5 calories in a brownie, and c 5 calories in a cheese stick.

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