Aptitude - Alligation or Mixture - Discussion

Let 100 liter of milk be 100Rs.

When 25% of water is added the total amt of mixture = 125 L (100L of milk and 25 L of water)
Therefore % of water in mixture is 25/125 * 100 = 20%.

CP = 100
Added cp = 25
total = 125
Non genu = 100/125 = 4/5.

Equate value must less than = .1
profit =1 - 4/5,
1/5 = 20%.

I'm not able to understand the solution. So please someone help me to get it.

If ingredient worth no value (water) is added to another ingredient of some value(milk), when the mixture (solution) is sold at cost of ingredient with some value and profit earned is 'P' percent, then amount of ingredient with no value(water) added = (P/100) x Amount of Milk.
Ratio of Water to Milk is P:100

If Solution is sold at some other rate than rate of milk, say K% higher or lower rate than milk, than;
Actual rate of solution = Rate of milk x (100+k)/100, when rate is K percent higher than rate of milk; and,
Actual rate of solution = Rate of milk x (100-k)/100, when rate is K percent lower than rate of milk.
Let the actual Rate be S,
Let P = S-100.
Ratio of Milk to Water is, P:100.

I will not able to understand that please give me easy example's to understand.

Please, help me.

Say the vendor buys L liters of milk and the cost of this is X.
Now, the vendor mixes some amount of water so the quantity is becoming say (L+Z) the cost of this is X(original cost)+25/100(X) that would be 5X/4.

Cost---->quantity
X---->L
5X/4--->?
So, ? = 5L/4,
So (L+Z) = 5L/4,
Z =L/4,

So, that would be 25% right but the answer is 20%.

Please someone help me.

How to find out the weight of the water mixed in gm per kilogram of milk?

Suppose Milk man have 100 litre he want sell same 100 litre by adding some water.

Milk...................100 litre(initially)
Milk+ water.......100 litre(after addition of milk)
So, milk = 100-water.

Now, cost price Rs/-100.
Because of 25% profit selling price Rs/-125
100 * 100 = (100-water) * 125.
Water = 20.
Out of 100 litre water quantity is 20 litre.
So, answer is 20%.

Simple.

Gain=25.
Total milk =125.
Then 25/125=20%.

Thank you all for explaining it.