exam Maths Puzzle Numerical Ability

X=4y+5
X=3y-2

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The equation is D=P-2112/64...the curretn depth of the diver is 4032 pounds...i need help solving that problem a total of $1150 was invested, part of it at 12% and part at 11%. the total yield was $133.75. how much invested at each rate?