exam Maths Puzzle Numerical Ability

Circle: C=25pie in.
Find the exact radius

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exam Other Question

i am lost how to solve it

4x/(x-1) - 2/(x+1) - 4/(x-1) is = 2(2x-1)/(x-1)
simplify (show your work)

3/5 divided by 1 and 1/5 x 1 and 2/3