SOLUTION: In a 40 -litre mixture of milk and water,the water is 10%.How much water is to be added to get a new mixture in which the water is 20%.

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: In a 40 -litre mixture of milk and water,the water is 10%.How much water is to be added to get a new mixture in which the water is 20%.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 836365: In a 40 -litre mixture of milk and water,the water is 10%.How much water is to be added to get a new mixture in which the water is 20%.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
w is how much water to add to increase the "concentration of water"

%2840%2A10%2B100%2Aw%29%2F%2840%2Bw%29=20
Solve for w.

Water in mixtures or solutions is usually treated as the carrier, and not as one of the materials to be referenced for concentration. This exercise reverses that idea.

My profile page has a lesson for this.