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QUESTION 2 1 POINT
Tracey needs 20 mL of a 50% acid solution for a science experiment. He has available a 20% solution and a 70% solution.
How many milliliters of the 20% solution and how many milliliters of the 70% solution should he mix to make the 50%
solution?

Respuesta :

davishoots08

Answer:

Step-by-step explanation:

Let

�

x be the amount (in milliliters) of the 20% solution and

�

y be the amount of the 70% solution.

The total volume of the mixture is

�

+

�

=

20

x+y=20 mL.

The equation for the amount of acid in the mixture is

0.20x+0.70y=0.50×20.

Now, we can set up a system of equations:

x+y=20

0.20x+0.70y=10

​

We can solve this system to find the values of x and y.

I made a mistake in the second equation. It should be 0.20x+0.70y=0.50×20. I apologize for the confusion. Let me correct that.

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