The average score of 14 students was calculated as 71. But later it was found that marks of one student were recorded as 42 instead of 56 and as 74 instead of 32 of the other. Correct average?

PQRS is a cyclic quadrilateral. If ∠P is three times of ∠R and ∠S is four times of ∠Q, then the sum of ∠S + ∠R will be:

If x = z = 225 and y = 226 then the value of : x³ + y³ + z³ – 3xyz is

A number when divided by 6 leaves remainder 3. When the square of the same number is divided by 6, the remainder is : 

The volume of a cone is $${27720cm^2}$$. If the height of the cone is 20 cm, then what will be the area of the base?

A shopkeeper gives discounts of 10% on the T.V. The marked price of T.V. is Rs. 8000. After allowing discount, a shopkeeper gain 20 %. Find the cost price of a T.V.

 In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son? 

A man bought an old typewriter for ₹1200 and spent ₹200 on its repair. He sold it for ₹1680. His profit percent is :