The ratio of two numbers is 5 : 11. If both numbers are increased by 10, the ratio becomes 7 : 13. What is the sum of the two numbers?

The length, breadth and height of a room is 21 metres, 12 metres and 16 metres. What will be the length of the largest rod that can be placed in that room?

After 4 years, the difference between principal and simple interest is Rs. 228 at the rate of 6 percent simple interest, so what is the amount of principal?

If x - y = 6 and xy = 40, then  find $$ {x^2+y^2}$$

The total number of students in sections A and B of a class is 72. The ratio of the number of students in A and B is 7 :5 . The average weight (in kg) of the students in section B is 20% more than that of the students in section A. If the average weight of all the students in the class is 52 kg, then what is the average weight (in kg) of the students in section B?

A's 2 days work is equal to B's 3  days work. If A can complete the work in 8 days, then to complete the work B will take: 

(x+2y) (x² + 4y² – 2xy) equal to- 

1, 3, 5, 7, ………total average of 25^th number  is: