The ratio of income of A to B is 6: 7. A and B, combining their savings, decided to go to a restaurant, and divided the expenditure in the ratio of 4: 3, respectively. If B has spent 140 rupees, which is 20% of its income, then what is the income of A?

B's expenditure is 140 rupees, which is 20% of B's income. So B's income = 140/0.20 = 700 rupees. The ratio of A's income to B's income is 6:7. If A's income = 6x and B's income = 7x, then 7x = 700, giving x = 100. Therefore A's income = 6 × 100 = 600 rupees. The information about expenditure division ratio (4:3) is irrelevant to finding A's income.