The income of Neel and Kamal of last year in the ratio of 4:3 respectively. The ratios of their individual incomes of the last year and the present year are 3:4 and 5:6 respectively. If their total income of the present year is Rs 34840. Then find last year income of Kamal?

Let Neel's and Kamal's last year incomes be 4x and 3x respectively. Their present year incomes are in ratio 3:4 and 5:6 respectively, so Neel's present income = 4x·(4/3) = 16x/3, and Kamal's present income = 3x·(6/5) = 18x/5. Total present income = 16x/3 + 18x/5 = (80x + 54x)/15 = 134x/15 = 34840, so x = (34840·15)/134 = 3900. Kamal's last year income = 3x = 3 × 3900 = 11700.