Maths Guru Needed

[Jabba]

arggggg, I hate maths

ok forget the volumes I have stated above
I need to know how much water to add to what volume of a 30% solution to make 1ltr of a 10% solution
I can buy the 30% solution in 100ml or 250ml if that helps

333 ml of the 30%, add RO water to make 1 liter (667 ml of RO water).

Same result different method ;-) ...

I add 700ml to 350ml in my method and get slightly over 1 litre and no faffing about measuring the original solution - 1 250ml and 1 100ml .....

 

[iSnail]

Just going over what Andy's written and confirming what the others have posted,

If you require precisely 1 litre of 10% solution then you need
333ml of 30% solution i.e. 3 and 1/3 bottles
add 666ml of water


If 900ml of the 10% solution will suffice then

use 3 bottles of the 30% solution (300ml in all)
add 600ml water
This wil give you 900ml (300+600) of the 10% concentration you want.

 

[The-Wolf]

thank you all, it is very much appreciated

 

[Matty P]

What are you trying to do anyway??

 

[smmetz]

As stated, you can get 3 of the 100ml bottles, and add 200ml to each (or 600 ml total), which gives you 900 ml of the 10% solution.

Alternatively, 1050ml of the 10% solution (or 1.05 liters), you can buy a 250 and a 100 ml bottle of the 30% solutions. Add 500 ml water to the 250 bottle, and add 200 ml water to the 100 bottle. Now you have 750 + 300 ml of the 10% solution.