RRB Exam Numerical Ability Probability

8 men can complete a piece of work in 12 days, how many addition men will be required to complete double to work in 6 days.
a) 24
b) 34
C) 36
D) 38

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RRB Other Question

If a^b=b^a, then the value of (a^2/b^2)^ab is
a) a^2b
b)b^2a
c)1
d)2
If 1/(cuberoot(4)+squareroot(2)+1) = a * cuberoot(4) + b * squareroot(2) + c and a,b,c are rational numbers then a+b+c is equal to

1.0
2.1
3.2
4.3