Question

A chemical company makes two brands of antifreeze. The first brand is 45% pure antifreeze, and the second brand is 70% pure antifreeze. In ord gallons of a mixture that contains 65% pure antifreeze, how many gallons of each brand of antifreeze must be used?

Answer 1

5 gallons of 70% antifreeze, 1 gallon of 45% antifreeze

Explanation:

Many different combinations can be made to equal 65% pure antifreeze.

Essentially, this problem is asking us to find a combination that fits a mean of 65%. So, multiply 5 by 70 to get 350, and 1 x 45 to get 45. Add 350 + 45 together to get 395, and divide by the total amount of gallons used - 6.

395/6 = 65, which is the target value.