A barrel contains a mixture of wine and water in the ratio 3: 1. How much fraction of the mixture must be drawn off and substituted by water so that the ratio of wine and water in the resultant mixture in the barrel becomes 1:1?
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Let the barrel contains wine 3x litres and water x litres.
Then, total mixture=4x litres
Let the part of mixture drawn out be p litres.
∴(4x−p)×
4
3
:(4x−p)×
4
1
+p=1:1⇒3x−
4
3p
=x+
4
3p
⇒2x=
4
6p
⇒p=
6
2x×4
=
3
1
(4x)∴
3
1
part of mixture is drawn out.
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