The average age of 12 students is 20 years. If the age of one more student is included, the average decreases by 1. What is the age of the new student?

The ratio of the ages of Meena and Meera is 4 : 3. The sum of their ages is 28 years. The ratio of their ages after 8 years will be

How many of the integers between 110 and 120 are prime numbers?

The number of prime numbers between 0 and 50 is

The number of prime numbers between 301 and 320 are

What is the minimum number of four digits formed by using the digit 2, 3, 0, 7?

38649 – 1624 – 4483 = ?

587 x 999 = ?

The HCF of two numbers is 11 and their LCM is 7700. If one of these numbers is 275, then the other one is 

The H.C.F. and L.C.M. of two numbers are 50 and 250 respectively. If the first number is divided by 2, the quotient is 50. The second number is

A rectangular courtyard 3.78 metres long and 5.25 metres wide is to be paved exactly with square tiles, all of the same size. What is the largest size of the tile which could be used for the purpose?