Red marbles vs blue marbles!
Karl bought bags of red marbles for dollars per bag, and bags of blue marbles for dollars per bag. If he bought twice as many bags of blue marbles as red marbles, then in terms of , what was the average cost, in dollars, per bag of marbles?
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1 solution
Ignore z and replace it with 2 x .
Total money spent on red bags = x ⋅ y = x y .
Total money spent on blue bags = 2 x ⋅ 3 y = 6 x y .
Total money spent = x y + 6 x y = 7 x y .
Total number of bags = x + 2 x = 3 x
Average cost = 3 x 7 x y = 3 7 y