exam Maths Puzzle Numerical Ability

How many quarts of water does one add to 6 quarts of a 60% alcohol solution to create a 40% alcohol solution?

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exam Other Question

A U.S. Department of Justice report included the claim that "in spouse murder cases, wife defendants were less likely to be convicted than husband defendants." Sample data consiste x+y=-4
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x-y=2

I am trying to figure out the method you use to solve this problem. The instructions says to solve using the addition method. find out the value of x and