A seller wants a profit of 20% on the sales. Thus the percentage he should add to the cost price will be:

Sania got 182 marks and failed by 18 marks. To pass she had to secure 40% marks. What were the max marks ?

The average age of 30 boys in class and a teacher is 15. If the age of the teacher is 30 year what would be the average age of boys only ?

If 9+3-3=30 and 4+2-5=13 what is 7+4-8

How many 3s are there in the following number series which are preceded by 5 and followed by 4 if

3 1 2 3 4 5 3 4 7 8 9 3 1 5 3 4 2 6 7

What is the rational number equal to 0.712712712 .................a