Problema Solution
How many quarts of pure antifreeze must be added to 8 quarts of a 20% antifreeze solution to obtain a 40% anti solution? (Hint: pure antifreeze is 100% antifreeze.)
Answer provided by our tutors
Let x represent the quarts of 100% pure antifreeze
0.20*8 + 1.00*x = 0.40(8 + x)
........
........
x = 8/3 qt
x = 2 1/3 qt
x = 2.67 qt
2.67 quarts of pure antifreeze must be added.