exam Maths Puzzle Numerical Ability

I invested $18,000. Part of it was invested at 3% annual simple interst and the rest was invested at 4%. I earned $650 in interest for the year. How much did I invest at each rate?

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exam Other Question
Solve each system by the addition method.

(1/8)x+(1/4)y+5
(1/6)x+(1/2)y=7



and



1.5x-2y=-0.25
3x+1.5y=6.375 xyz-1 power - xz-1 power/yz-1 power -1