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Mathematics 9 Online
OpenStudy (anonymous):

Help please! The radiator in a car is filled with a solution of 75% antifreeze and 25% water. The manufacturer of the antifreeze suggests that for summer driving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is 3.9 L, how much coolant should be drained and replaced with water to reduce the antifreeze concentration to the recommended level?

OpenStudy (anonymous):

|dw:1337855935704:dw| \frac 13 \times 3.9 = 1.3 L or water should be added.

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