Section A has 25 students with an average score of 76. Section B has 35 students with an average score of 64. The combined average score of all students is :

In a group of 50 students, average score is 70. Average of 30 boys is 75. Find average of 20 girls.

Four years ago, the average age of A and B was 20 years. If today average age of A, B and C is 25 years, what will be age of C after 7 years?

If the number of quantities in group A is 10 and in group B is 8, and their individual average is 24 and 16 respectively, find the combined average of the two groups.

The average of all prime numbers between 60 and 80 is:

The average marks of 13 papers are 40. Average of first 7 is 42 and last 7 is 35. Marks obtained in the 7th paper are