Question
The average age of 20 children and their teacher's age
are 18 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?Solution
Sum of the age of total children = 21 × 18 = 378 Sum of the age of children after excluding teacher = 20 × 17 = 340 Teacher’s age = 378 – 340 = 38 years
More Average Questions
What will come in place of (?) question mark in the given number series.
12, 27, 44, 65, ?, 139
124, 107, 91, ? , 62, 49
257, 399, 566, ?, 983, 1237Â
12   18   31   51   ?   112
37, 57, 82, ?, 147, 187
41, 82, ?, 984, 4920, 29520Â Â Â
What will come in place of the question mark (?) in the following series?
4, 3, 7, 26, 101, ?
15, 31, 67, 131, ?, 375
- What will come in place of the question mark (?) in the following series?
121, 115, 102, 82, 55, ? 188    178    158   ?     88    38
