Question
The average weight of 6 students in a group is 45 kg. If
one student is replaced by person 'B', the average weight of the group increases by 5%. Find the difference between the weight of the student who left and the weight of person 'B'.Solution
ATQ,
Total weight of the group = 45 × 6 = 270 kg
New average weight of the group = 45 × 1.05 = 47.25 kg
So, total weight of the group = 47.25 × 6 = 283.5 kg
So, difference between weights of the student who left and person 'B' =
283.5 - 270 = 13.5 kg
Alternate Solution—
Required difference = 0.05 × 45 × 6 = 13.5 kg
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
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