Mean of numbers, weighted averages and age-related averages.
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Q1 · Average · EASY
The average of three numbers is 40. If two of the numbers are 35 and 42, what is the third number?
Q2 · Average · MEDIUM
The average of 5 consecutive odd numbers is 21. What is the largest of these numbers?
Q3 · Average · HARD
The average weight of 8 persons increases by 2 kg when a new person replaces one of them weighing 65 kg. What is the weight of the new person?
Q4 · Average · EASY
Find the average of 10, 20, 30, and 40.
Q5 · Average · MEDIUM
The average of 5 numbers is 28. If one number is excluded, the average becomes 25. What is the excluded number?