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Sagot :
12 gallons of 95% of antifreeze and 18 gallon of 70% of antifreeze for the mixture
What is Percentage?
In mathematics, a percentage is a number or ratio expressed as a fraction of 100.
What is Linear equation?
An equation between two variables that gives a straight line when plotted on a graph.
Given,
Quantity of pure antifreeze in first brand = 70%
Quantity of pure antifreeze in second brand = 95%
Consider,
x is the gallons in 95% pure antifreeze in the mixture
(30-x) is the gallon in 70% pure antifreeze in the mixture
We need to obtain 30 gallons of a mixture that contains 80% pure antifreeze.
Then the equation will become
0.95x + 0.70(30-x) = 0.8 × 30
0.95x-0.70x+21 =24
0.25x = 3
x = 12 gallons
There fore we need 12 gallons of 95% of antifreeze and 30-12 =18 gallon of 70% of antifreeze for the mixture.
Hence, 12 gallons of 95% of antifreeze and 18 gallon of 70% of antifreeze for the mixture
Learn more about Percentage and Linear equation here
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