In ∆ABC, AC = BC and ∠BAC = 40°. If BC is extended to D such that BC = CD, find out ∠ADC = ?

Find the exact value of the following question:

$$ (13+2\sqrt{5})^2=?\sqrt{5}+189 $$

The average marks of the students of a class is 68. The average marks of girls in the class is 80 and that of boys is 60. What percentage of students are boys in the class?

Find the value of   $$ {(0.75)^3\over1-.75}+[0.75+(0.75)^2+1]$$

A bar graph shows unit production and unit sold of the different type of mobile company A, B, C, D E and F. Study the bar graph and give the answer of following questions.

Which mobile company have the maximum difference between the unit produced and unit sold.

Two circles intersect at A and B, P is a point on produced BA. PT and PQ are tangents to the circles. The relation of PT and PQ is 

If AD, BE and CF are medians of ∆ABC, then which one of the following statements is correct? 

The least number, which when divided by 4, 5 and 6 leaves remainder 1, 2 and 3 respectively is: