Asked by Mat
By mass a certain material is 75% sand and another is 30% sand. How many tonnes of each must be mixed in order to have 250 tonnes of material that is 50% sand?
Answers
Answered by
Reiny
75% amount --- x
30% amount --- 250-x
.75x + .3(250-x) = .5(250)
solve for x
30% amount --- 250-x
.75x + .3(250-x) = .5(250)
solve for x
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