book Maths Puzzle Numerical Ability

cos: (4pi/3)

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I have done this before, however I am not coming up with the correct way to solve the problem. Ax+By=c solve for y? Emily received $1,240 from selling her car. She inversted part of the money at 8% and the rest at 7%. Her overall return was 7.59%. How much did Emily invest in thew account which