exam Maths Puzzle Numerical Ability

40. c+3/c-1 = c+2/c-3

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exam Other Question

Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%? Given: WX=YZ
Prove: WY=XZ