The ratio of the monthly income of Krushn and Mallika is 4 : 5 and the ratio of their expenditure id 2 : 3. If their total expenditure is `6000 and the ratio of their savings is 8 : 7, then find their income.
The ratio of income of two gentlemen is 9:7 and the ratio of their expenditure are 4:3. If each of them manages to save Rs. 2000 per month, find the difference in their monthly income.