SOLUTION: a 50 pound bag of a cement-sand mixture is 40% sand. How many pounds of pure 100% sand must be added for the resulting mixture to be 60% sand

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Question 1136821: a 50 pound bag of a cement-sand mixture is 40% sand. How many pounds of pure 100% sand must be added for the resulting mixture to be 60% sand
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
p pounds of pure sand to add

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40%2A50%2B100%2Ap=60%28p%2B50%29
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4%2A50%2B10p=6p%2B300
200%2B4p=300
4p=100
highlight%28p=25%29