book Maths Puzzle Numerical Ability

How would you solve the following:

x(y+12) divided by 10 (x-y) x=5 y=3



r-4 divided by 7-r

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book Other Question

You invest a total of $14,000 in two accounts paying 3% and 6% annual interest, respectively. How much should be invested at each rate if the total interet earned for the first yea factor the following:

4x2 - 39x + 27