The average age of 9 students and their teacher is 16 years. The average age of the first four students is 19 years and…

Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years wil…

Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of …

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of al…

The average age of 30 boys in a class in 15 years. One boy, aged 20 years, left the class, but two new boys came in his …

In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the…

The average weight of 15 students in a class increases by 1.5 kg when one of the students weighing 40 kg is replaced by …

A person purchase 1 kg of tomatoes from each of the 4 places at the rate of 1 kg, 2 kg, 3 kg, 4 kg per rupee respectivel…