book Maths Puzzle Numerical Ability

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?

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please help me in this question....
10^6 -2.5*10^-1*10^-6
if 35% of a school was 8th graders and there are 252 8th graders, what is the total school population?

thanks for the help