A man purchases 100 copies of a book from the publisher and gets a discount of 25%. He buys 50 copies from a retailer at a discount of 10%. He got an overall discount of:

Direction: Study the following graph carefully and answer the following questions.

What is the difference between average demand and average production of the five companies taken together?

Direction: Study the following graph carefully and answer the following questions.

The production of company D is approximately how many time that of the production of company A?

If one of the equal angles of an isosceles triangle is 65°, then the angle at the vertex is

G is the centroid of a triangle ABC, and the median is AD, the ratio of AD and GA is

The ratio of circumradius and hypotenuse a right-angled triangle is

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to

If 12x – 15 y =9x + 5y, the value of $$ {x^{2}+{y^{2}}\over{x^{2}-y^{2}}}$$ is