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Quantitative Aptitude
Two Sets Venn Diagram
Q 3. A pot of...
Question
Q 3. A pot of grey paint contains black and white paint. 15% of the paint is black.
(a) What percentage of the grey paint is white?
(b) How much black paint would be required to make 3.5 litres of grey paint?
(c) How much white paint would be needed to make 5.2 litres of grey paint?
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Solution
Hi
,
Pot
contains
only
two
colour
so
if
15
%
is
black
then
percentage
of
white
=
10
-
15
=
85
%
so
ratio
of
black
and
white
paint
=
15
:
85
=
3
:
17
b
;
-
grey
paint
=
3
.
5
litres
So
here
ratio
of
black
and
white
colour
is
=
3
:
17
so
black
paint
quantity
=
3
3
+
17
×
3
.
5
=
0
.
525
litres
c
;
-
grey
paint
=
5
.
2
litres
So
here
ratio
of
black
and
white
colour
is
=
3
:
17
so
white
paint
quantity
=
17
3
+
17
×
5
.
2
=
4
.
42
litres
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