Simple and weighted average.
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Q1 · Average · EASY
The average of five numbers is 48. If one number 56 is excluded, the average of the remaining four numbers is:
Q2 · Average · MEDIUM
The average weight of 8 boys is 52 kg. If one boy weighing 56 kg leaves and a new boy joins, the new average becomes 51 kg. What is the weight of the new boy?
Q3 · Average · EASY
The average of 20, 30, 40, 50 and x is 35. What is the value of x?
Q4 · Average · EASY
A student scored marks in five subjects as follows: 72, 68, 80, 75 and x. If the average marks of all five subjects is 74, what is the value of x?
Q5 · Average · HARD
The average of 15 numbers is 40. The average of the first 8 numbers is 35 and the average of the last 8 numbers is 48. What is the 8th number?