exam Maths Puzzle Numerical Ability

A box contains four defective and six good electronic sensors. If five sensors are drawn, with replacement, find the probability of drawing
(a) at most one defective
(b) at least

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exam Other Question

I am totally lost on this two question and need some help.
Solve and check the following eqaution for x:
x/x-5+2=5/x-5

and

5/x+6+2/x^2+7x+6=3/x+1 Thank you A boy is 4 years old and his sister is three times as old as he is. When the boy is 12
years old, how old will his sister be?