Question
The average weight of 14 students in a class is 20 kg.
If a student leaves the class, the average weight of the class drops by 4 kg. Find the weight of the student (in kg) who left the class.Solution
The average weight of 14 students =20kg. Total weight =20×14=280kg. After a student leaves a class then average =20-4 =16kg Total weight of 13 students =13×16=208 kg. Weight of a student who left the class =280-208=72 kg.
What will come in place of the question mark (?) in the following series?
1528, 1416, 1204, ?, 480, -32
143 Â Â Â Â 119Â Â Â Â 107Â Â Â Â 101Â Â Â Â Â 98Â Â Â Â ?
96 89 ? 90 94 91
...What value should come in the place of (?) in the following number series?
19, 235, 260, 324, 333, ?
What will come in place of the question mark (?) in the following series?
305...
In each of the following number series, one term is missing. Find the missing term.
3, 5, 20, 24, 144, 150, ?
1029, 1030, 1039, 1064, ?, 1194
75, 80, 95, ?, 155, 200
What will come in place of the question mark (?) in the following series?
1515, 184, ?, 455, 967, 624
7 29 61 ? 211 349
...
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