The ratio of 2 person's income is 9 : 7 and their ratio ofexpenditures is 4 : 3. If each of them saves Rs 2000 per month, find their monthly incomes.

Let the income of the persons be 9x and 7x

Let the expenditure of the persons be 4y and 3y.

Now it is given that both of them saves 2000 each.

So

9x-4y = 2000 1..

7x-3y = 2000 2 ..

From 1... x = 2000+4y /9x

Putting this value of x in 2....

we get 7x* 2000+4y /9x - 3y = 2000

28y+14000/9 - 3y = 2000

3y+2000 = 28y+14000/9

27y+ 18000 = 28y+14000

y+14000 = 18000

y = 4000

So the expenditure of 1st person will be 16000 and 2nd person will be 12000

Income = expenditure+saving

So the income of first person will be 16000+2000 = 18000

And the income of second person will be 12000+2000 = 14000

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