Question
The average age of a class of 18 girls is 14 years. If 2
new girls having average age of 10 years join the class, then the average age of the class becomes:Solution
Total age of 18 girls = 18 × 14 = 252 years Total age of 20 girls = 252 + (2 × 10) = 272 years Therefore new average age = 272/20 = 13.6 years
More Average Questions
What will come in place of the question mark (?) in the following series?
22, 28, 37, ?, 72, 102
99, 101, 107, 131, 251, ?
18Â Â Â 19Â Â Â 34Â Â Â 111Â Â Â Â 428Â Â Â Â 2165Â Â Â Â ?
...72, 79, 100, 135, 184, ?
51    52    48     57    ?      66      30
...135, 148, ?, 184, 207, 236
13, 29, 65, 129, ?, 373
96 89 ? 90 94 91
...Find the missing number, in the given number series.
360, 322, ?, 252, 220
12   18   31   51   ?   112
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