Example 1

A radiator's capacity is 16 gallons. If the radiator is full of a 40% antifreeze solution, how many gallons must be drained and replaced with a 75% solution to obtain a full radiator of 45% antifreeze solution?

A diagram is helpful here (see Figure 1).

So equation, or equation gallons must be drained and replaced.

figure A diagram of the problem posed in Example .


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