Question
A rectangle with a length of 16 cm and breadth of 8 cm
is rolled through its length to form a hollow cylinder. What will be the volume (in cm³) of the cylinder? (Use π = 3.14)Solution
ATQ, The circumference of the circular end of the cylinder = breadth of the rectangle. So, 2 × π × radius = 16. 2 × 3.14 × radius =16 
Now, the height of the cylinder = breadth of the rectangle = 8 cm. Required volume 
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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