exam Maths Puzzle Numerical Ability

One type of gasohol is 10% alcohol and another type is 35% alcohol. How much of each type must be mixed to obtain 400 gallons of a 25% alcohol mixture?

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exam Other Question

Factor completly
5x^2-5xy-10x+10y please help me the question is a take home test.

in chemistry class, 9 liters of a 4% SILVER IODIDE solution must be mixed with a 10% solution to get a 6% solution. how many liters of the 10% solution are needed?