The ratio of the monthly incomes of X and Y is 5 : 4 and that of their monthly expenditures is 9 : 7. If the income of Y is equal to the expenditure of X, then what is the ratio of the savings of X and Y ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 9 : 8
Let the income of X and Y is 5a and 4a.
The expenditure of X and Y be 9b and 7b.
If the income of Y is equal to the expenditure of X then,
4a = 9b
a/b = 9/4.
Let a = 9 units and b = 4 units then,
| Income | Expenditure | Savings | |
| X | 45 | 36 | 9 |
| Y | 36 | 28 | 8 |
The ratio of the savings of X and Y = 9 : 8.