exam Maths Puzzle Numerical Ability

This problem is very complicated, please help

D = c-s/n = for s

Thanks

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exam Other Question

Solve the following algebraically. You must show all your work.
1/4 = 3 - (2x-1)/(x+2)

x^(3/2) = 125 Please help me solve this problem. factor completely: solve: 12x^2-6x=0