I need help here~!

A chemist has 20 pints of mixture that is 50% acid. How much water must be add to make the mixture 40% acid?

Question

I need help here~!

A chemist has 20 pints of mixture that is 50% acid. How much water must be add to make the mixture 40% acid?

mrnood · Answer

How much water and how much acid is there in the original mixture?

anonymous · Answer

20 mixture of acid and 20 mixture of water

mrnood · Answer

no - it is 50% each

how many pints each is that?

anonymous · Answer

Sorry. I wrote the question wrong. It is supposed to be 40.

mrnood · Answer

OK 

so if you add x pints of water

how much total will there be?
how much acid will there be?

anonymous · Answer

I don't get the questions. :/

anonymous · Answer

Can you rephrase them?

anonymous · Answer

I have trouble with English.

mrnood · Answer

you start with 

20 pints acid + 20 pints water

if you add x pints of water

how much total will there be?
how much acid will there be?

mrnood · Answer

how many pints will there be all together
how many pints of acid will there be

anonymous · Answer

So you add the mixture of 20 acid and 20 mixture of water?

anonymous · Answer

And you add 40%?

mrnood · Answer

you also ad x pints of water (that is the unknown amount that we need to find)

mrnood · Answer

|dw:1437750063429:dw|

find x so the mixture is 40% acid