Question

How many quarts of permanent anti-freeze must be added to 10% quarts of a 40% anti-freeze solution in a radiator of a truck to make a 25% anti-freeze solution?
Fix the typo(s)

You cannot add 100% antifreeze to 40% antifreeze and wind up with 25% antifreeze.

Either you are adding water, or you have 10% antifreeze.

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