exam Maths Puzzle Numerical Ability

3x=-3y-21;(0,1)

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exam Other Question

Jenny inherits $42,900 and invests it for a year in two stocks. Stock A earns 12.5% annually and stock B earns 8.5% annually. How much did she invest in each stock if stock B earned three-quarters as much as stock A? PLease help to solve

2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6