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A lab technician needs a 40% solution of a certain chemical

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arpitjain
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A lab technician needs a 40% solution of a certain chemical [#permalink] New post   10 Jul 2019, 05:53
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A lab technician needs a 40% solution of a certain chemical for an experiment, but the lab that she works in only has a 20% solution and a 50% solution in stock. In what ratio should she mix the 20% solution with the 50% solution in order to obtain the 40% solution that she needs?

1:3

1:2

2:3

2:1

3:1
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Re: A lab technician needs a 40% solution of a certain chemical [#permalink] New post   10 Jul 2019, 06:55
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arpitjain wrote:
A lab technician needs a 40% solution of a certain chemical for an experiment, but the lab that she works in only has a 20% solution and a 50% solution in stock. In what ratio should she mix the 20% solution with the 50% solution in order to obtain the 40% solution that she needs?

1:3

1:2

2:3

2:1

3:1


Let the total 20% solution be = X

and total 50% solution be = Y

As per ques;

\(0.2x +0.5y = 0.4 (x +y)\)

or \(0.2x = 0.1y\)

or \(\frac{x}{y}= \frac{1}{2}\)
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Re: A lab technician needs a 40% solution of a certain chemical [#permalink] New post   17 Jun 2024, 16:34
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A lab technician needs a 40% solution of a certain chemical [#permalink]
17 Jun 2024, 16:34
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