Ahmed earns Rs. 85,000 and spend Rs. 51,000 in the year. Then the ratio of his income to expenditure is ______?

4:3

3:2

5:3

None of these

Given Ahmed's income is Rs. 85,000 and expenditure is Rs. 51,000:

The ratio of income to expenditure is 85,000 : 51,000.

To simplify, divide both parts by their greatest common divisor, which is 17,000:

85,000 / 17,000 = 5

51,000 / 17,000 = 3

So, the ratio is 5:3.