Question

11. * A bottle of my favourite drink contains 12% alcohol. On my doctors advice I added 20ml water
to the bottle to reduce the concentration to 10%. What was the quantity of drink in my bottle
initially?​

Answer 1

Answer:100ml

Step-by-step explanation:

Let the amount of drink in bottle be x

Then,

amount of alcohol=0.12x

Amount of water=0.88x

After adding 20ml water

Concentration of alcohol becomes 10%

Which implies that of water is 90%

Now,

(0.88x+20)/(x+20)=90%

=>x=100ml