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

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

anonymous · Answer

I will give out medals!!

jhonyy9 · Answer

@ksaimouli do you have any idea ?

welshfella · Answer

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

welshfella · Answer

do you follow that?
can you solve that equation?

welshfella · Answer

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

anonymous · Answer

Yeah thanks