2021 · Q52
The ratio of monthly incomes of A and B is 7:10. The ratio of their expenditures is 2: 3. If each of A and B saves 1,000 per month, then what will be the monthly income of B?
general-mental-abilityquantitative-aptitude
- A9,000
- B10,000
- C15,000
- D12,000
Explanation
Let the monthly incomes be 7x and 10x. Each saves 1000, so expenditures are (7x − 1000) and (10x − 1000), in the ratio 2:3. Solving (7x − 1000)/(10x − 1000) = 2/3 gives 21x − 3000 = 20x − 2000, so x = 1000. B's monthly income is 10x = 10,000. Hence option B is correct.