book Maths Puzzle Numerical Ability

My question says to remember the formula 1020 sqrt P (1-.01 sqrt P)=G. If P is the population in thousands. this formula is the amount of water in gallons per minute the city needs

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book Other Question

I am thinking of two whole numbers. When I add them, their sum is 123. When I subtract the lesser number from the greater number, their difference is 45. what are my numbers? If possible, simplify the ratinoal expression.

y^2 - 81 / 2y - 18