The average height of 5 students is 160 cm. If one student of 150 cm is replaced with a new student, and the new average height is 162 cm, what is the height of the new student?

A family of four members has an average age of 35 years. If a baby is born, what will be the new average age of the family 3 years later?

The average age of a group of 5 boys is 16 years. If one boy aged 20 leaves the group, what will be the new average age?

Find the average of the numbers: 10, 20, 30, 40, 50.

The average of 8 numbers is 20. If each number is increased by 4, what is the new average

The average of 7 consecutive numbers is 13. What is the largest of these numbers?

The average of 5 quantities is 6. The average of 3 of those 5 quantities is 8. What is the average of the remaining two quantities?

The average of four numbers is 50. If the first number is reduced by 5, the second by 10, and the third by 15, what will be the new average?

The average of 20 numbers is zero. What is the maximum number of numbers that can be greater than zero?

What is the average of all prime numbers between 30 and 50?