The average mathematics marks of two Sections A and B of class IX 131 the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratios of the number of students of Section A and B is:

What is the height of a solid right circular cylinder whose radius is 3 cm and total surface area is 60 πcm² ?

A shopkeeper offers the following three schemes. Scheme-I: Two successive discounts of 15% and 25% Scheme-II: Buy 5, get 3 free Scheme-III: Buy 4, get 6 Which scheme is the best for customers?

The value of $${1.6×1.6×1.6−1.6×1.6×1.6}\over 1.6×1.6+1.6×1.6+1.6×1.6 $$ is

The curved surface area of a cylinder is five times the area of its base. Find the ratio of radius and height of the cylinder.

The average of 11 numbers is 7. If each number is doubled, what will be the new average of the numbers?

Find the area of the triangle whose sides are 5 cm, 12 cm and 13 cm.

A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is