A student multiplies a number with 7.2 instead of 0.72. If due to this answer is 2592 more than the right answer, then what was the original number? 

0.1 and   of a bamboo are in mud and water respectively and the rest of length 2.75 m is above water. What is the length of the bamboo? 

The total cost of 18 pens and 23 pencils is Rs. 231, while the total cost of 7 pens and 13 pencils is Rs. 102. What is the cost of 4 pens and 9 pencils?

If difference of cube and square of a number is 100 and difference of square and number is 20, then value of number is 

N is the smallest three digit prime number. When N is divided by 13, then what will be the remainder? 

How many numbers can be completely divided to 240?

Find the value of 13/16 share of land whose 9/7 share is worth 10,116.

Find the average of all prime numbers from 1 to 20?