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What is the correct answer?
4
A
mixture
contains alcohol
and
water
in
the ratio
4 : 3.
If
5 litres of water
is
added
to the mixture, the ratio becomes
4: 5.
Find the quantity of alcohol
in the given mixture
A.
11 ltr
B.
12ltr
C.
10ltr
D.
15ltr
Correct Answer :
C. 10ltr
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4
x
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3
x
l
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s
r
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s
p
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c
t
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v
e
l
y
4
x
/
(
3
x
+
5
)
=
4
/
5
⇔
20
x
=
4
(
3
x
+
5
)
⇔
8
x
=
20
⇔
x
=
2
.
5
Q
u
a
n
t
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t
y
o
f
a
l
c
o
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o
l
=
(
4
x
2
.
5
)
l
i
t
r
e
s
=
10
l
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s
.
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