Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

What decimal of a week is an hour? 

Find the average of the following set of numbers.
132, 148, 164, 128, 120, 136

The total marks obtained by Abhishek in Zoology, Botany and Chemistry together is 180 more than the marks obtained by him is botany. What are the average marks obtained by him is zoology and Chemistry together?

The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes: 

The average weight of A B and C is 40 kg . if the average weight of A and B be 48 kg and that of B and C be 45 kg , then find the weight of B ?

The average weight of P, Q and R is 93 kg. If the average weight of P and Q is 89 kg and that of Q and R average weight is 96.5 kg ,  then the weight (in kg) of Q is____.

The average of four consecutive even numbers is 15. The 2nd highest number is: