A, B can dig a well in 10 days and 12 days respectively. If Rs.11 is for total work what is A share.

\par A's one day's work =  \frac{1}{10}

\par B's one day's work =  \frac{1}{12}

\par Ratio of (A+B)'s one day work =  \frac{1}{10} : \frac{1}{12} = 6 : 5

\par Amount should be shared in 6 : 5 ratio

\par A's share =  \frac{6}{11} \times 11 \par = Rs. 6