How many gallons of a 80% antifreeze solution must be mixed with 100 gallons of 25% antifreeze to get a mixture that is 70% antifreeze? Use the six-step method.
2 answers:
<span>0.7X+0.25*100=0.6(100+X)
0.7X+25=60+0.6X
0.7X-0.6X=60-25
0.1X=35
X=35/0.1</span>
X=350 GALLONS OF 70%
We have 100 gallons of 25% antifreeze. How much of 80% antifreeze do we need to add to make a 70% solution? .25 * 100 + .80x = .70 * 100 + x 25 + .80x = 70 + .7x .1x = 45 x = 450 gallons of 80% must be added to make a 70% solution.
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