A man purchased a bedsheet for₹ 450 and sold it at a gain of 10% calculated on the selling price. The selling price of the bedsheet was 

What is the area (in cm²) of the circumcircle of a triangle whose sides are 6 cm, 8 cm and 10 cm respectively?

The principal which gives ₹ 1 interest per day at a rate of 5 % simple interest per annum is 

Ajay. Vijay and Sashi can do a piece of work in 20, 40 and 60 days, respectively. In how many days can Ajay do the work if he is assisted by Vijay and Sashi on every fourth day?

A wholesaler purchased 7 hair clips for a rupee. How many for a rupee must he sell to get profit of 40%?

The LCM of two positive integers is twice the larger number and the HCF of the two numbers is 3. The smaller number is:

Value of $$ \sqrt{6+\sqrt {6+\sqrt {6+....}}}$$

The average age of 32 boys of a class is equal to 15 years. When the age of the class teacher is included the average becomes 16 years. Find the age of the class teacher.