BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

A chemical supply company has 60 liters of a 40% HNO3 solution. How many liters of pure...

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 2214
Joined: Fri Mar 02, 2018 2:22 pm
Followed by:5 members

Re: A chemical supply company has 60 liters of a 40% HNO3 solution. How many liters of pure...

by deloitte247 » Sat Feb 22, 2020 4:09 am
60 liters of 40% HNO3 solution
The concentration of HNO3 present in the solution is 40 liters in 100 liters for 40% HNO3
The concentration of HNO3 in 60 liters is
$$\frac{60\cdot40}{100}=24\ liters$$
Let the volume of pure undiluted HNO3 = x
Volume of pure HNO3 to add in order to increase concentration =>
24 + x = 50% of (60+x)
24 + x = (1/2) (60+x)
2(24+x) = 60+x
48 + 2x = 60 + x
2x - x = 60 - 48
x = 12 liters of pure HNO3 must be added in order to have a concentration of HNO3 solution.

Answer = option A
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8086
Joined: Sat Apr 25, 2015 10:56 am
Location: Los Angeles, CA
Thanked: 43 times
Followed by:29 members

Re: A chemical supply company has 60 liters of a 40% HNO3 solution. How many liters of pure...

by Scott@TargetTestPrep » Sun Mar 01, 2020 1:08 pm
AAPL wrote: ↑
Mon Feb 17, 2020 5:04 am
 Magoosh

A chemical company has 60 liters of a 40% HNO3 solution. How many liters of pure undiluted HNO3 must the chemist add so that the resultant solution is a 50% solution?

A. 12
B. 15
C. 20
D. 24
E. 30

OA A
We add 60 liters of 40% solution and n liters of 100% solution, obtaining (60 + n) liters of 50% solution. We can create the following equation:

60 x 0.4 + n =0.5(60 + n)

24 + n = 30 + 0.5n

0.5n = 6

n = 12

Answer: A

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Post new topic Post Reply
• Page 1 of 1