The average height of 10 boys is 170 cm. If one boy’s height is neglected, the average height is increased by 1 cm. Find the height of the neglected boy?

The average height of the students of a class would be increased by 6 cm if 12 children were 8 cm taller. How many children are there in the class?

There are some girls and boys in a group. The average height of the girls is 135cm and the average height of the boys is 150cm. Given that the the average height of all the children in the group is 138cm, what fraction of the children are girls?

The average age of 10 boys and the principal is 15 years. When the principal’s age is excluded, the average age decreases by 1 years. What is the age of the principal?

When Sarah was 10 years old, she was 130 cm tall.Two years later, her height had increased by 15%.Find Sarah's height when she was 12 years old.

The average height of 50 students in class is 182 cm. 40 students whose average height is 182.5 cm left the class and 50 students whose height is 180.5 cm joined the class. Find the average height of the present? Options180.411804.41182.41183.41