An angle is four times its complementary angle. What is the measure of the angle?

A sells a good to B at a profit of 20% and B sells it to C at a profit of 25%. If  C pays Rs. 225 for it, what was the cost price of A?

The value of $$ {\sqrt{0.6912}+{\sqrt{0.5292}}\over {\sqrt{0.6912}-{\sqrt{0.5292}}}}$$ is:

If a + b: b+c : c+a= 6:7:8 and a + b+c= 14, , then the value of c is : 

If the length of the diagonal AC of a square ABCD is 5.2 cm, then the area of the square is: 

A can complete a piece of work in 10 days, B in 15 days and C in 20 days, A and C worked together for two days and then A was replaced by B. In how many days, altogether, work was completed?

In a regular polygon, the exterior and interior angles are in the ratio 1 : 4. The number of sides of the polygon is 

3x² = 36 then what is the value of x?