Question
The average age of a class of 20 girls is 12 years. If 4
new girls having average age of 9 years join the class, then the average age of the class becomes:Solution
Total age of 20 girls = 20 × 12 = 240 years Total age of 24 girls = 240 + (4 × 9) = 276 years Therefore new average age = 276/24 = 11.5 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
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