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

If a triangular prism and a triangular pryamid have equal bases and equal altitudes, the volume of the prism is how many times the volume of the pyramid? Passes through (8,3) is perpandicular to y=4x+11

a) y=-4x+35
b) y=4x-29
c) y=-1/4x+5
d) y=1/4x+1