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Question

A vessel is filled with liquid, 3 parts of which are water and 5 parts syrup. How much of the mixture must be drawn off and replaced with water so that the mixture may be half water and half syrup?

Options:
A .   1 3
B .   1 4
C .   1 5
D .   1 7
Answer: Option C

Suppose the vessel initially contains 8 litres of liquid.


Let x litres of this liquid be replaced with water.



Quantity of water in new mixture =
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
3 -
3x
+ x
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
litres
8



Quantity of syrup in new mixture =
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
5 -
5x
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
litres
8



A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
3 -
3x
+ x
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
=
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
5 -
5x
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
8
8


A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A... 5x + 24 = 40 - 5x


A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A... 10x = 16



A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A... x =
8
.
5



So, part of the mixture replaced =
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
8
x
1
A Vessel Is Filled With Liquid, 3 Parts Of Which Are Water A...
=
1
.
5
8
5


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