Question

After spending 1/7th of his income a man is left with Rs. 600. Find his total income.

Answer 1

Let total income $=x$
Money spent $=1/7x$

Money left $=x-1/7x=6/7x$
So according to the question
$\frac{6x}{7}=600$

or, $x=700$.

So his income is $700$.