book Maths Puzzle Numerical Ability

what is the answer for -1/7z - 5= 0. I keep getting 35

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Suppose that you have a supply of a 30% solution of alcohol and a 70% solution of alcohol. How many quarts of each should be mixed to produce 20 quarts that is 40% alcohol? how do i simplify 1/4d+2-3/5d+5