exam Maths Puzzle Numerical Ability

is 0 a solution of 4-3b=4-5b

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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? can you help me write this system as a matrix equation and solve using an inverse matrix please?...
s + p + c = 40
c = 4p
s = p - 2