nickleoncio0705 nickleoncio0705

16-01-2018
Mathematics

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How many gallons of a 70% antifreeze solution must be mixed with 100 gallons of 25% antifreeze to get a mixture that is 60% antifreeze? Use the six-step method.

You need ___ gallons.

(Round to the nearest whole number.)

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jorel1380 jorel1380

16-01-2018

Let n be the amount of 70% antifreeze. Then:
.7n+.25(100)=.6(100+n)
.7n+25=60+.6n
.1n=35
n=350 gallons of 70% antifreeze is needed
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