Fraction and Simplification, Average and Mean

Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is:

The average of 50 numbers is 30. If two numbers, 35 and 40, are discarded, then the average of the remaining numbers is nearly.

If the average (arithmetic mean) of five distinct positive integers is 10, what is the differe between the largest possible value of the greatest integer and the least possible value of greatest of the five integers?

If 7x + 3y = 17 and 3x + 7y = 19, what is the average of x and y?

The average height of girls in a class is 5ft and that of boys is 5.7ft. If the average height of the students in class is 5.5 ft what could be the possible strength of boys and girls respectively in the class:

What is the average of odd numbers from 1 to 40?

The average of 8 numbers is 8. If 4 is subtracted from each of 6 of these numbers, what is the new average?

X's marks are 70, 90, 65, 85 and 75. What marks he must get on the next test to raise her average to 80?

After 3 semesters in college, Jim has a 3.0 GPA. What GPA must Jim attain in his fourth semester if he wishes to raise his GPA to a 3.1?

Siddik has a new set of golf clubs. Using a club 8, 7, and 6 the ball travels an average distance of 100m, 108m, 114m respectively. How far will the ball go if he uses a club 5?

A batsman makes a score of 80 runs in the 16th innings and increases average by 3. What is his average after 16th innings?

A Petrol tank now is 1/2 full. After you remove 8 gallons petrol from the 1/2 full tank the tank is then 1/10 full. What is the capacity, in gallons, of the tank? 

The average weight of A, B and C is 45kg. If the average weight of A and B is 40 kg and that of B and C is 43 kg, then the weight of B is-

The average temperature on Wednesday, Thursday and Friday was 25°C. The average temperature on Thursday, Friday and Saturday was 24°C. If the temperature on Saturday was 27°C, what was the temperature on Wednesday?

Denominator of a proper fraction is 3 more than the numerator. If the fraction is squared, its denominator will be 39 more than the numerator. The fraction is

The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is-

If the average of 5 positive integers is 40 and the difference between the largest and the smallest of these 5 numbers is 10, what is the maximum value possible for the largest of these 5 integers?

In June a baseball team that played 60 games had won 30% of its games played. After a phenomenal winning streak this team raised its average to 50%. How many games must the team have won in a row to attain this average?

In a set, there are 17 consecutive integers with a maximum value of 8. What is the average of the set?

The average (arithmetic mean) of x and y is 20. If z = 5, what is the average of x, y, and z.