book Maths Puzzle Numerical Ability

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?

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book Other Question
Describe to me the five steps that are used in solving linear systems by substitution? How would you solve the following:

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



r-4 divided by 7-r