book Maths Puzzle Numerical Ability

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?

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c+3(c-2)-c=22+5c-32 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