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UPSC CDS 1 2021 Math Paper
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© examsnet.com
Question : 18
Total: 100
In a mixture of 80 litres of a liquid and water, 25% of the mixture is the liquid. How much water should be added to the mixture so that the liquid becomes 20% of the mixture?
15 litres
20 litres
24 litres
25 litres
Validate
Solution:
👈: Video Solution
liquid in 80 litres of mixture
=
25
%
of
80
=
20
And water in the mixtue
=
80
−
20
=
60
Let
x
litres of water is added in the mixture, so
20
80
+
x
=
20
%
20
80
+
x
=
1
5
80
+
x
=
100
x
=
20
litres
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