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IBPS RRB Officer Prelims 16 Sep 2017 Paper
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© examsnet.com
Question : 41
Total: 80
A mixture of milk and water in a jar comprises 12 litre of milk. If 5 litre of pure milk and 3 litre of pure water were added to this jar, the percentage of water in the new mixture would be 20%. What was the initial quantity of water in the jar? (in litre)
5
4
2
6
1.25
Validate
Solution:
(5) Let the quantity of waterin the original mixture be xlitres.
According to the question,
x
+
3
17
+
x
+
3
=
20
100
⇒
x
+
3
20
+
x
=
1
5
⇒ 5x + 15 = 20 + x
⇒ 5x – x = 20–15
⇒ 4x = 5
Þ
x
=
5
4
= 1.25 litres
© examsnet.com
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