book Maths Puzzle Numerical Ability

i am trying to figure out the answer to a question regarding a racing engine were rpm x torque / 5250 = hp . i know the the rpm and the hp but i cannot figure out how to get the t

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book Other Question
Rearrange the following so that the given letter becomes the subject:

-x = z - by; y =

Please show your working out (1)

Find the LCM
4y^2-25; 2y^2+9y+10; 2y^2-y-10