exam Maths Puzzle Numerical Ability

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1/y^2-1 over 1+1/y

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exam Other Question

i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution


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Abe, brian, and Carmela share the responsibility of caring for the family pets. during a seven day week, abe and brian each take 3 days and carmela takes the other one. in how many different orders can the days of a week be assigned?