If the radius and height of a cylinder increase by 20% and15% respectively. Then what is the % change in curved surface area? 

In a school, number of girls is 75% of number of boys. Difference between boys and girls is 30. On a particular day 20% girls were absent, then find the number of girls those who present? 

A man read 2/5 part of a book in 1st day, 34% in second day and remaining page in next two days. In two days he read equal number of page. If he read 52 page on last day, then find out how many page did the book contain? 

In how many ways can letter of the word MAILINGS arrange so that M and N always come together? 

What should come at place of question mark (?) in the following number series?

1.7 5.4 19.2 80.8 409 ?

What should come at place of question mark (?) in the following number series?

15 20 50 165 680 ? 

The ratio between speed of boat in down stream and speed of stream is 9 : 1. If the speed of current is 3 km/hr, then find the distance travelled in upstream in 5 hours. 

A can do a work in 24 days and B is 20% more efficient than A. If C can do the work in 10 days more than B, then find the days taken by A and C together to complete the work.