How many times the keys of a typewriter have to be pressed in order to write number from 121 to 1346?

What is the greatest number which will divide 110 and 128 leaving a remainder 2 in each case?

Find the value of

The greatest number that can be subtracted from 10000 so that the remainder may be divisible by 32, 36, 48 and 54 is:

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? 

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

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?