A car travel to a place 150 km away at an average speed of 50 km/hr and returns it 30 km/hr. What is the average speed of the whole journey?

The average of x numbers is 48. If of the numbers are increased by 51 each and remaining are decreased by 71 each, then what is the new average?

A batsman makes a score of 87 runs in the 17^th match and thus  increases his average by 3. Find his average after 17^th match.

In an examination, 40% of the candidates write their answers in Urdu and the rest in Marathi. The average marks of the candidates writing in Urdu is 74 and the average marks of the candidates writing in Marathi is 77. What are the average marks of all the candidates? 

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

What is the age of A in a group of 6 students – A, B, C, D, E and F whose average age is 16 years?
Statement I: Total age of B and D is 30 years
Statement II: Total age of E and F is 31 years.
Statement III: Total age of A is 10 years.

A group consists of 25 men and 20 women. The average weight of men is 48 kg and that of women is 30 kg. The average weight of the group is