book Maths Puzzle Numerical Ability

if 35% of a school was 8th graders and there are 252 8th graders, what is the total school population?

thanks for the help

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book Other Question

An executive invests $23000, some at 6% and some at 7% annual interest. If he recieves an annual return of $1510, how much did he invest at each rate? A swimming pool can be filled in 6 h and requires 9 h to drain. If the drain was accidentally left open for 6 h while the pool was being filled, how long did filling the pool require?