The ratio of income of Anil and Mukesh is 2 : 3. The sum of their expenditure is Rs.8000 and the amount of savings of Anil is equal to the amount of expenditure of Mukesh. What is the sum of their savings? 

Given that the ratio of income of Anil and Mukesh is 2 : 3.

Suppose that Anil income is $2x$ and Mukesh income is $3x$

Given that the sum of their expenditure is $8000$ rupees.

suppose that the Anil expenditure is $y$, so that the Mukesh expenditure is $8000-y$

Since the amount of savings of Anil is equal to the amount of expendiutre of Mukesh, 

 $\begin{array}{rcl}2x-y& =& 8000-y\\ 2x& =& 8000\\ x& =& 4000\end{array}$

Hence the sum of their savings is 

$\begin{array}{rcl}\left(2x-y\right)+\left[3x-\left(8000-y\right)\right]& =& 5x-8000\\ & =& 5\left(4000\right)-8000\\ & =& 20000-8000\\ & =& 12000\end{array}$

Therefore the sum of their savings is $\boxed{\mathbf{12}\mathbf{,}\mathbf{000}}$