Question

40litres of milk contain 10percent water.find the quantity of water to added to milk so it may contain 20percent water ​

Answer 1

Answer:

Let the amount of water to be added be liters.

We want the percentage of water to increase from 10% to 20% or percentage of non-water to decrease from 90% to 80%. Note that when we add liters of water the amount of non-water in mixture in liters remains the same, so:

--> .

Or, the amount of water after adding liters of water () should be equal to initial amount of water () plus the amount of water we add ()

--> .

Hope it helps.

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Amount of water = 10% = 10/100x 40=4 liters amount of milk 40-4=36 liters. Milk 10 = 40 liter; water 100 = 1 liter; mixture 20= 40l x l= 10*40 + 100x = 20 (40+x)x=5. The answer is 5 liters of water.