Question

The percentage of water in 20 litres of adulterated milk is 10. The quantity of water to be added to it, to increase the percentage of water to 25 percent, is:

Answer 1

Answer:

adulterates milk of 20 lites water =2 lites

now 2+ water =(20+w) ×25%

8+4×water= 20 + water

3× water=12

water=4 litres

is reuired quantity.

Answer 2

Answer:

4 litres

Step-by-step explanation:

Percentage of water in 20 litre milk is 10% so

10% of 20 is 2 hence 20 litre milk has 2 litre water in it.

Now we have to add water in it such that total percentage of water becomes 25 %

let us take water as x

so adding x in 20 litre of milk as well as 10 % of water

2 + X =(20 + X ) x 25%

2 + X =(20 + X ) x (25 ÷100)

200 + 100X = 20x25 + 25 X

100X-25X =500-200

75X = 300

X = 300÷75

X= 4