exam Maths Puzzle Numerical Ability

find all values of u

4- 3/u+2=5/u+3

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exam Other Question

why does the expression c-1 work in a problem like 0.5 times (c-1)+ 5.4
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***5.4 is the size of one container |
***c is how many 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?