The average age of 40 students of class is 18 years. When 20 new students are admitted to the same class, the average ag…

The sum of three consecutive even numbers is 28 more than the average of these three number. Then the smallest of these …

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age o…

Average of ten positive numbers is x. If each number is increased by 10%, then x :

a, b, c, d, e, f, g are consecutive even numbers. j, k, l, m, n are consecutive odd numbers. The average of all the numb…

The arithmetic mean of 15 numbers is 41.4. Then the sum of these numbers is-

The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the f…

The marks of six boys in a group are 48, 59, 87, 37, 78 and 57. What are the average marks of all six boys?