If the cost of 1 dozen apples is Rs. 18, then the cost of 25 apples will be -

A can write 75 pages in 25 hrs. A and B together can write 135 pages in 27 hrs. In what time can B write 42 pages?

If on a marked price the difference of selling prices with a discount of 30% and two successive discounts of 20% and 10% is 72, then the marked price (in rupees) is  

13x -14= 9x+10 what is the value of x ?

The diameter of two cones is the same. If the ratio of their slant height is 5 : 4, then find the ratio of their areas. 

The length of the two sides forming the right angle of a right-angled triangle are 6 cm and 8 cm, then find the length of its circum radius:

A person invested Rs 3000 on compound interest for two years. If the rate of interest is the 25 % for the first year and 20 % for the second year. Then find the CI?

What is the sum of all three-digit numbers which are divisible by 20?