math

The deck of a swimming pool had the same width all the way around. The perimeter of the pool is 50m. The outside perimeter of the deck is 74m. What is the width of the deck?

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  1. I assume the pool is rectangular, with width x and length y. So, if the deck has width w,

    2(x+y) = 50
    2(x+2w + y+2w) = 74
    2(x+y)+2(4w) = 74
    50+8w = 74
    8w = 24
    w = 3

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  2. How?!?

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