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

what is the square root of 400 and 900 Intersections and Unions
If p={-3,-2,0,1,5}
T={0,1,6,9}
and S={-3,1,6}
find T U S
How do i do This?
Thank you