Question 922933
We need a total of 9 qts
We want to know how many qts at 2% to mix with 4%
a+b=9,
0.02*a+0.04*b=.24
a=9-b
0.02*(9-b)+0.04*b=0.24
0.18-0.02b+0.04*b=0.24
0.02*b=0.06
b=3.0
a=9-b
a=6.0 qt at 2%
b=3.0 qt at 4%
check
0.02*6.0+0.04*3.0=.24
0.12+0.12=0.24
0.24=0.24
ok

A. Nathan used twice as much 2% milk as 4% milk.
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