book Maths Puzzle Numerical Ability

Evaluate the algebraic expression:

10 + 3x / (2 + 2x) when x = 5

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book Other Question

I am having so much trouble with Multiplying and dividing rational expressions. I don't know where to begin with this one. Please help.
5a^4c/12b x 24bc^2/15a^3b^2 Simplify the following expression as mucch as possible:
Assume that all variables represent positive real numbers.

t^2 square root of 8tx^2 - x square root of 18t^5