Math algebra
posted by Shane .
The radiator in a car is filled with a solution of 60% antifreeze and 40% water. The manufacturer of the the antifreeze suggests that, for summer diving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is 3.6 liters, how much coolant should be drained and replaced with waterto reduce antifreeze concentration to the recommended level.

Math algebra 
Damon
presently is
.6 * 3.6 = 2.16 af
.4 * 3.6 = 1.44 h2o
should be
.5 * 3.6 = 1.8 af
1.8 h2o
add x liters water
take out .6 x af and .4 x water
new af = 1.8 = 2.16  .6 x
so
.6 x = .36
x = .6
==============
check
new water = 1.44  .4(.6) + .6
= 1.8 whew
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