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y = x/k so 15 = 6/k making k = 0.4. when x = 10 y = 10/0.4 ie 25

alternatively y/x = k ie 15/6 = k so k = 2.5; y/10 = 2.5 making y = 25.

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Q: If y varies directly as x and y equals fifteen and when x equals 6 find y when x equals 10?
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