Question

Marie mixes 20 L of 12% acid solution with a 36% acid solution to make a 20% acid solution how many liters of 36% solution did she use?

A. 10 liters
B. 12 liters
C. 13.7 liters
D. 16 liters

Answer 1

I will give out medals!!

Answer 2

@ksaimouli do you have any idea ?

Answer 3

work in amounts of pure acid
20 L of 12% solution contains 200*0.12 pure acid

let x be the volume of 36% solution we have

200*0.12 + 3.6x = 2(x + 20)

solve for x

Answer 4

do you follow that?
can you solve that equation?

Answer 5

do you understand why it is 200*0.12 liters of pure acid?

Answer 6

Yeah thanks