Five pens and four pencils cost as much as three pens and seven pencils. What is the
ratio of the cost of One pen to the cost of One Penci
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Cost of a pencil = x
cost of pen = x+3
10x + 5(x+3) = 30
10x + 5x + 15 = 30
15x = 15
x = 1
cost of pencil = 1
cost of pen = 1+3 or 4
cost of pen = x+3
10x + 5(x+3) = 30
10x + 5x + 15 = 30
15x = 15
x = 1
cost of pencil = 1
cost of pen = 1+3 or 4
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