Question
The average age of boys and girls in a class is 10.5
yr; that of the boys is 10.6 yr and that of the girls is 10.1 yr. If there are 60 boys in the class, how many girls are there in the class?Solution
By alligation rule, Boys            Girls 10.6             10.1         10.5 10.5-10.1  :    10.6 - 10.5 0.4       :     0.1 4        :      1 Therefore, if there are 60 boys, then there are 15 girls(=60/4).
What should come in place of (?) question mark in the given number series.
81, 73, 66, 60, 55, ?
14 6 4 4 ? 48
...What should come in place of (?) question mark in the following number series.
5, 11, 23, 47, 95, ?
In each of the following number series, one term is missing. Find the missing term.
1, 4, 9, 16, 25, ?
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
156, 182, 210, 240, 272, ?
31    32      35      ?      47       56
...What should come in place of (?) question mark in the following number series.
1, 2, 6, 24, 120, ?
What value should come in the place of (?) in the following number series?
71, 72, 76, 103, ?, 244254, ?, 1022, 1150, 1214, 1246
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