22 boys, working together, can complete a work in 10 days, whereas 25 boys and 12 girls take 8 days to complete the same work In how many days can only 6 girls, working together, complete the same work?
The average of a certain set of 'b' numbers is 'a', and the average of a certain set of 'a' numbers is 'b'. What is the average of all the numbers taken together?
The area of a square is 1296 sq.cm. and the radius of a circle is 6/7 of the length of a side of the square. What is the ratio of the perimeter of the square and the circumference of the circle?