exam Maths Puzzle Numerical Ability

x^2-9x=0

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exam Other Question

m^5/5 divided by m^10/10. I am thinking to hard once again. My question is: Suppose that you have a supply of a 30%solution of alcohol
and 70% of solution of alcohol. how many quartz of each should be mixed to poduce 20 quartz that is 40%alcohol?