6 boys and 8 men get a total wage of Rs. 8000 in 4 days. 8 boys and 6 men get a total of Rs. 6000 in 3 days. What will be the efficiency ratio of a boy and a man respectively?

In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?

A bag contains 1 rupee, 50 paise and 25 paise coins in the ratio 5:7:9 if he total amount in the bag is Rs 430 find the number of coins of each?

In a school there are 650 students. The ratio of the boys to that of the girls is 8:5. How many more girls should join the school so that the ratio becomes 4:3