book Maths Puzzle Numerical Ability

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?

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

thanks for the help Tell whether the given value is the solution of the equation



m/1.4=5,m=7