exam Maths Puzzle Numerical Ability

Hi I need help on these questions the answers are fine :) I know that these are considored four questions
Thanks for the help

1. 4(x+2)/5x6x^2/2x

2. a^2-9/a^2 a^2-3a/a^2+

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exam Other Question

18 men can do a work in 16 days.AFTER 3 DAYS 5 MEN LEFT. HOW MANY DAYS IT WILL TAKE TO GET THE REMAINING WORK DONE?
Solve the equation: x+2-2 sqrt of x+2 =0
The answer is one of the following: A.x=-2,2 B.x=-2,0 C.x=4 D.x=4,8

Thank you!