Problema Solution
how much pure antifreeze must be added to 12 gallons of 20% antifreeze to make it 40% antifreeze?
Answer provided by our tutors
Let 'x' represent the amount of pure 100% antifreeze
0.20*12 + 1.00*x = 0.40(12 + x)
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x = 4 gal
4 gallons of pure antifreeze must be added.