The average height of 25 boys is 1.4 m. When 5 boys leave the group, then the average height increased by 0.15 m. What i…

The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest?

Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56,…

The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average mon…

A man spends his three months income in four month time. If his monthly income is Rs. 1000 then his annual savings is ?

David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, mathematics, physics, chemistry and bi…

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…

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of t…