How many numbers can be completely divided to 240?

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

The difference between the sum of four consecutive odd numbers and three consecutives even numbers together is 20. Also, the largest even number is 5 more than the largest odd number. What is the sum of the smallest odd number and the smallest even number?

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

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

0.1 and   $${5\over 8}$$ 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? 

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? 

What least value must be assigned to ‘*’ so that the number 63576 * 2 is divisible by 8?