Five years ago, the total of the ages of a father and his son was 40 years. The ratio of their present ages is 4 : 1. What is the present age of the father?

Pushpa is twice as old as Rita was 2 years ago. If the difference of their ages be 2 years, how old is Pushpa today?

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