In a certain college the number of girls is twice the number of boys. 1/5th of the girls and 1/8th of the boys took part in a social camp. What part of the total number of students took part in the camp ?
The annual incomes and expenditures of man and his wife are in the ratios of 5 : 3 and 3 : 1, respectively. It they decide to save equally and find a balance of Rs. 4000 at the end of year, their incomes were