self Maths Puzzle

.
The curved surface area of a cylindrical pillar is 264 m2 and its volume is 924 m3. Find the ratio of its diameter to its height.

A. 3 : 7 B. 7 : 3
C. 6 : 7 D. 7 : 6

Read Solution (Total 1)

volume of cylinder 22/7 r^2 h
area of cylinder 2(22/7)r h
so,
(3.14 r^2 h)/2(22/7) r h=924/264
=>r=7
again 2(22/7)r h=264
=>h=6
therefore,
the ratio is 2r:h=14:6=7:3
11 years agoHelpfull: Yes(1) No(1)

self Other Question

0.
A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, the volume of the box (in m3) is:

A. 4830 B. 5120
C. 6420 D. 8960 A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:

A. 90 cm B. 1 dm
C. 1 m D. 1.1 cm