math

Suppose that 16 inches of wire costs 64 cents.
At the same rate, how many inches of wire can be bought for 48 cents?

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  1. 48 is 3/4 of 64 cents
    so, what's 3/4 of 16 inches?

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  2. 16:64=48:x
    16/64=48/x
    1/4=48/x
    by cross multiplication
    x=192
    so you can buy 192inches of wire.

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