Mean and weighted average.
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Q1 · Average · EASY
The average of five numbers is 42. If one number is excluded, the average of the remaining four numbers becomes 40. What is the excluded number?
Q2 · Average · MEDIUM
A cricket player has an average of 58 runs in 15 innings. How many runs must he score in his next innings to increase his average by 2 runs?
Q3 · Average · MEDIUM
The average weight of 40 students in a class is 55 kg. If the weight of the teacher is included, the average weight increases by 500 grams. What is the weight of the teacher?
Q4 · Average · HARD
The average age of a family of 6 members is 28 years. If the age of the youngest member is 8 years, what was the average age of the family at the time of birth of the youngest member?
Q5 · Average · MEDIUM
The average of 5 numbers is 48. If one number is excluded, the average becomes 45. What is the excluded number?