Question

This is math… i swear please do not leave i have had 4 people leave me :(

Answer 1

B

1) To solve this question, we can write out two equations within this expression:

`\begin{gathered} (x)30+(30-x)15=30(20) \\ 30x+450-15x=600 \\ 15x=600-450 \\ 15x=150 \\ (15x)/(15)=(150)/(15) \\ x=10 \end{gathered}`

So we can do it with 10L of that 30% solution.

2)Let's find the other volume, plugging into that x=10, since the whole volume of this new solution is 30L we can subtract from that 30L that 10L we have just found:

`30-10=20l`

3) So we found 20l of the 15% solution.

Thus the answer is B