A circle touches all four sides of a quadrilateral ABCD. If AB = 18 cm, BC = 21 cm and  = 15 cm, then length CD is: 

The ratio of the number of boys and girls in the parade of students of a school is 9 : 7 respectively and the total number of students is 256. Find the number of girls?

A car covers the first 35 km in 45 minutes and the remaining 69 km in 75 minutes. What is the average speed of the car?

In a circle, O is the centre of the circle. Chords AB and CD intersect at P. If ∠AOD=32° and <COB = 26°, then the measure of ∠APD lies between:

if 120% of a is equal to 80% of b, then $${b+a}\over {b-a}$$ is equal to

The radius of a cone is 20 cm and height is 21 cm, the total surface area of the cone is in square cm:

Directions: Read the below data carefully and answer the following questions.
The table shows the total number of ice cream (Chocobar + Cornetto) was given by Santa Claus on the day of Xmas to 5 children. It also shows the number of Chocobar ice-creams is how much more or less percentage of the total number of Cornetto ice-creams.

Find the difference between the total number of Cornettoes all of them have and the total number of Chocobars everyone has.

What is the value of $${cos^2A\over {1+sinA}}$$?