Aptitude - Ratio and Proportion - Discussion

In the tank we have 60 litter:

Case 1
For ratio 2:1
We have 40:20

Case 2
For ratio 1:2:

Now the thing is that as you can see from case 2 ratio which is 1:2 it means we have to twice the value of water and we not want to change milk quantity which is 1 so,

(2/3*60) + 20(from precious case 1 water ratio)
= 60.

We have used 2/3 from basic ratio formula.

2x + x = 60.

Volume of water X = 20
Volume of milk y = 2x = 40.

Now keeping the volume of milk fixed i.e y = 40
Therefore y+2y=z,
40+(2*40)=z,
Z=120.

Therefore volume of water is 120-40=80.
But volume already present is 20 so additional water to be added is 80-20=60 litre.

It is said in the question that the ratio is 2:1 which means 40 litres of milk and 20litres of water should be there. Now the new ratio should be 1:2 of the obtained result (40 litres stands for 1parts and 20 litres stands for 2 parts) now in this mixture there is 40 litres of milk and 80 litres of water. But there is already 20 litres of water is there in the previous 40 litre of milk so we deduct that 20 litres therefore we get new amount of water i.e. is 60 litres.

This Question can also be solved as:

2x/x = 60,
X = 30.
New ratio is 1:2.
Where 1 part is milk.
Nd 2x is water put the value of x.
Hence water = 60.

Thanks @Vinita Singh.

m-2:1-w.
m-1:2-w.
2:1 4-1=3 difference by addition of water,
2:4
3 * 60/3 = 60.

Thank you @Krishna you explained in the simple way.

Hey guys, I am going to ask one question. The question is here;

In a city, 40% of the adults are illiterate while 85% of the children are literate. If the ratio of the adults to that of the children is 2:3, then what percent of the population is literate?

1+2 = 3.
60/3 = 20.

Water value is change,
But milk remains the same so,
2:1
(1:2)*2= 2:4.

Change in water 4-1 = 3.
Hence,
3*20 = 60.

2:1 = 40+20 = 60.
New Ratio 1:2 = 20+40 = 60.
Answer 60.