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In 40 liters of milk and water the ratio of milk and water is 3:1. How

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V
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In 40 liters of milk and water the ratio of milk and water is 3:1. How  [#permalink]

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New post 30 Jan 2019, 01:38
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In 40 liters of milk and water the ratio of milk and water is 3:1. How much water should be added in the mixture so that the ratio of milk to water becomes 2:1

(A) 8
(B) 6
(C) 5
(D) 4
(E) 3

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Concentration: Accounting, Finance
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Re: In 40 liters of milk and water the ratio of milk and water is 3:1. How  [#permalink]

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New post 30 Jan 2019, 01:59
Bunuel wrote:
In 40 liters of milk and water the ratio of milk and water is 3:1. How much water should be added in the mixture so that the ratio of milk to water becomes 2:1

(A) 8
(B) 6
(C) 5
(D) 4
(E) 3



Total = 40 kg

Milk = 30
Water = 10 kg

Let the amount of water be x that we need to add to the existing mixture.

\(\frac{30}{(10 + x)}\)=\(\frac{2}{1}\)

20 + 2x = 30

2x = 10

x = 5.

C is the correct answer.
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Re: In 40 liters of milk and water the ratio of milk and water is 3:1. How  [#permalink]

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New post 30 Jan 2019, 02:04
Bunuel wrote:
In 40 liters of milk and water the ratio of milk and water is 3:1. How much water should be added in the mixture so that the ratio of milk to water becomes 2:1

(A) 8
(B) 6
(C) 5
(D) 4
(E) 3


given total 40 ltrs
milk = 3/4 * 40 = 30 ltrs and water = 10 ltrs
so
new ratio
30/(10+x) = 2/1
solve for x
x= 5
IMO C
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VP
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Joined: 07 Dec 2014
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In 40 liters of milk and water the ratio of milk and water is 3:1. How  [#permalink]

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New post 30 Jan 2019, 14:02
Bunuel wrote:
In 40 liters of milk and water the ratio of milk and water is 3:1. How much water should be added in the mixture so that the ratio of milk to water becomes 2:1

(A) 8
(B) 6
(C) 5
(D) 4
(E) 3


let w=amount of water to be added
1/4*40+w=1/3*(40+w)
w=5 liters
C
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Re: In 40 liters of milk and water the ratio of milk and water is 3:1. How  [#permalink]

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New post 31 Jan 2019, 01:24
1
Bunuel wrote:
In 40 liters of milk and water the ratio of milk and water is 3:1. How much water should be added in the mixture so that the ratio of milk to water becomes 2:1

(A) 8
(B) 6
(C) 5
(D) 4
(E) 3



No need to set up equations.

In 40 liters of milk and water, there is 30L of milk and 10L of water

To make it milk to water = 2:1..........then look to answer choices.

If we add only 5L of water then the ration becomes 15/30 = 1/2

Answer: C
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Re: In 40 liters of milk and water the ratio of milk and water is 3:1. How   [#permalink] 31 Jan 2019, 01:24
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In 40 liters of milk and water the ratio of milk and water is 3:1. How

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