Latest Infosys Aptitude Question SOLUTION: If a 10 lit. mixture contains milk and water in the ratio 2:1 then, how much more mixture should be added to change the ratio to 1:2 ?

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If a 10 lit. mixture contains milk and water in the ratio 2:1 then, how much more mixture should be added to change the ratio to 1:2 ?

Asked In Infosys PujaDas (9 years ago)

Solved Vinay Sipani Read Solution (6)

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Read Solution (6) :

Vinay Sipani   (9 years ago) Best Solution

If you add the same mixture again,the ratio will still remain the same.
The question should be how much water to be added


In 10 litres, let quantity of milk = 2x and quantity of water = x
=> 2x + x = 10
=> x = 10/3 , 2x = 20/3

Let y litres of water be added to make the ratio 1:2
=> (20/3) / (10/3 + y) = 1 / 2
=> 40/3 = 10/3 + y
=> y = 10 liters

Therefore,10 liters of water to be added.

Is this solution Helpfull? Yes (49) | No (5)  

kotte sruthi  (9 years ago)

quantity of milk=10*2/3=20/3
quantity of water=10*1/3=10/3
new ratio=1:2
milk:water=(20/3+x)/(10/3+x)=1/2
40+6x=10+3x
30=3X
x=10

Is this solution Helpfull? Yes (20) | No (3)  

SANTHOSH  (9 years ago)

unable to understand,can any body explain clearly,as if u explains newly kistening to this concept ???
plz plz plz

Is this solution Helpfull? Yes (4) | No   

surya  (8 years ago)

2:1 ratio clearly shows 6.66 lit of milk and 3.33 lit of water. To be a 1:2 ratio milk is kept constant and the water is to be double of milk content which is 13.32 litres in that we already have a 3.33 litres so remaining 10 litres should be added

Is this solution Helpfull? Yes (3) | No (1)  

Surit Datta  (9 years ago)

In 10 litres, let quantity of milk = 2x and quantity of water = x
=> 2x + x = 10
=> x = 10/3 , 2x = 20/3

Let y litres of water be added to make the ratio 1:2
=> (20/3) / (10/3 + y) = 1 / 2
=> 40/3 = 10/3 + y
=> y = 10 liters

Is this solution Helpfull? Yes (2) | No   

Agalya  (6 years ago)

Two mixtures are initially in the ratio p:q,then after adding some mixture we get new ratio a:b.Total quantity=x
Formulae to find the quantity of mixture to be added(quant)=(x(pb-qa))/(a(p+q))
quant=(10(4-1))/(1(3))=10
Ans:10 litres

Is this solution Helpfull? Yes (2) | No (1)  

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