TCS Company Numerical Ability Time and Work

.Y can do a work in 2/3 the time it takes X.Z can do the same work in ¾ the time it takes Y.When all three are typing at the same time what fraction of their total work does Y do
a)1/3 b)4/13 c)9/23 d)8/29

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TCS Other Question

If (3a+6b)/(5a+12b)=12/23 determine the value of 3a2+5b2/ab
a)19/2 b)32/3 c)9 d)31/3
The number of committes of size 10 that could be formed from 10 men & 10 women such that committee has atleast 6 women is
a)60626 b)210 c)10210 d)none