Marie mixes 20 liters of 12% acid solution with a 36% acid solution to make a 20% acid solution. how many liters of 36% solution did she use? 10 liters 12 liters 13.7 liters 16 liters

First Option

10 liters

Step-by-step explanation:

Let's call x the quantity in liters of the acid solution at 12%

Let's call z the amount in liters of the acid solution at 36%

Then the amount of acid in the solution will be:

We know that x = 20 liters, then we substitute x = 20 in the equation solve the equation for z

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8+10

step-by-step explanation:

you multiply 4 by 2 and 5 by 2