6,300
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90 x 70 = 6,300
Let X = gallons of 80% antifreeze Then 0.80X + .25 (90) = .70( 90 + X) .80X + 22.5 = 63 + .70X .1X = 41.5 X = 415 gallons
90 - 70 = 20
The answer is 70.70 + (0.90 x 70) =70 + 63 =133You can also solve this by:133 / 1.90 = 70
The tenth power.