<PRE><B>Question 818689</B>
(50 - v)(0.20) + v(1.00) = 50(0.40)
50(0.20) - v(0.20) + v(1.00) = 20
10 + v(0.80) = 20
v(0.80) = 10
v = 12.5
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answer:
drain 12.5 liters from the radiator, then add 12.5 liters of 100% antifreeze
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