Homework Help: Intermediate Algebra

Posted by Heather on Wednesday, August 31, 2011 at 6:34pm.

how many gallons of a 90% antifreeze solution must be mixed with 100 gallons of 30% antifreeze to get a mixture that is 80% antifreeze?

Intermediate Algebra - Reiny, Wednesday, August 31, 2011 at 8:47pm
let the amount of 90% antifreeze to be added be x gallons

.9x + .3(100) = .8(100+x)
times 10
9x + 3(100) = 8(100+x)
9x+300 = 800+8x
x = 500

500 gallons of the 90% must be added.

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