book Maths Puzzle Numerical Ability

2/3x=24,...

3(x-5)+7=16,...

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book Other Question

sina+cosa=7^.5/2

find the value of tan(a/2) Evaluate the algebraic expression:

11v + vw^2 - w when v=12 and w = -3

I came up with 243, my college tutor came up with something different. Is this correct?