30 oranges and 75 apples were purchased for Rs 510  If the price per apple was 2 then the average price of orange was?

The average marks of the students of a class is 68. The average marks of girls in the class is 80 and that of boys is 60. What percentage of students are boys in the class?

The average score of 14 students was calculated as 71. But later it was found that marks of one student were recorded as 42 instead of 56 and as 74 instead of 32 of the other. Correct average?

What is the average of the first five prime numbers?

What is the average of all odd natural numbers less than 100?

The average weight of 5 men is increased by 4 kg. If one of them who weigh 121 kg is replaced by another man, then what is the weight of the new man? 

The average of 10 numbers is 14. If each number is multiplied by 6 then what will be the new average?

The average of 11 numbers is 7. If each number is doubled, what will be the new average of the numbers?