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Other
Quantitative Aptitude
Solid Geometry
If radius of ...
Question
If radius of sphere is doubled find percentage increase in volume.
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Solution
Let
r
be
the
original
radius
of
the
sphere
Now
,
original
volume
=
4
3
πr
3
Let
R
be
the
new
radius
Now
,
new
radius
=
2
riginal
radius
⇒
R
=
2
r
Now
,
new
volume
=
4
3
πR
3
=
4
3
π
2
r
3
=
32
3
πr
3
Now
,
increase
in
volume
=
new
volume
-
original
volume
=
32
3
πr
3
-
4
3
πr
3
=
28
3
πr
3
percent
increase
=
increase
in
volume
original
volume
×
100
%
=
28
3
πr
3
4
3
πr
3
×
100
%
=
700
%
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