book Maths Puzzle Numerical Ability

I need to find the square root of the fraction 64/100? This is multiple choice A.4/5 B. the square root of 4/ the square root of 5 C. the square root of 8/ the square root of 10 D. 4 to the square root of 2/ 10? Please help me, thank you very much!

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book Other Question

2x-5(x+3)=81 The problem is 6-sqrt x = x. I can figure out that the answer is 4 but what would be the equation?