Aptitude - Ratio and Proportion - Discussion

Initial mix i.e, 60Ltr Old ration m : w :: 2 : 1 total parts 2 + 1 = 3parts of 60Ltr = 20Ltr.

Hence milk = 2 * 20 = 40Ltr, & water = 1 * 20 = 20Ltr.

But question is how much further or additional water is added to maintain the New Ratio 1 : 2 i.e, m : w :: 1 : 2 one should get Confused with initial mix i.e, 60Ltr.

Method of Substitution :
Already milk 40Ltr and water 20Ltr question is how much further or additional water is added to maintain the New Ratio 1 : 2.
We have [A]. 20 litres [B].30 litres [C].40 litres [D].60 litres.

Water should be 20 + either A,B,C,D but New Ratio 1 : 2 therefore w = 20 + 60 = 80 hence m:w = 40/80 = 1:2.

I hope you have understood the solution.

Milk = 2/3 * 60 = 40;
Water =1/3 * 60 = 20;

Aadd water = x (suppose)
then, 40/(20 + x) = 1:2.

x = 60 -> answer.

"In a vessel, containing 60 litres of a mixture of milk and water, water is only 30%. 12 litres of the mixture were taken out and X litres of pure milk were added. As a result percentage of water in the mixture became 18%. What is the value of X?" Can anyone please explain?

It is so simple.

First value of water = 1.
Second value of water = 3.

Therefore:
1/3 * 60 = 20
2/3 * 60 = 40
20 + 40 = 60.

There are two types of a mixture of milk and water. In the first mixture, out of 27 LTR, 24 LTR is milk only and in the second mixture, 40 LTR is milk and 5 LTR is water. Which one mixture is
better in terms of milk's strength?

Find the solution of the problem.

The Formula given by Shrikant and Biseswar is quite simple and useful. Thanks, @Biseswar & @Shrikant.

Yes, correct @Sushil.

Milk 40, 2.
Water 20,1.
To make water double as milk we should add 60.
Then 60+20=80, I.e double to 40(milk).

Easy method to find the quantity of ratio 2 : 1,
2x+1x = 60,
3x = 60,
X = 20, then 2x = 40,
40 + 20 = 60.

Just make it simple.

If the quantity of milk remains same 40.
And the new ratio is 1:2.
It means water is double then milk according to ratio then we have 40:80. And, minus the old water means 80-20 = 60.