Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 2276
Joined: Sat Oct 14, 2017 6:10 am
Followed by:3 members

If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution

by VJesus12 » Fri Jul 09, 2021 11:30 am

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution, what percentage of the original alcohol was replaced?

A. 3%
B. 20%
C. 66%
D. 75%
E. 80%

Answer: E

Source: GMAT Club Tests
Top
Legendary Member
Posts: 2229
Joined: Sun Oct 29, 2017 2:04 pm
Followed by:6 members

Re: If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solu

by swerve » Wed Jul 14, 2021 3:53 pm
VJesus12 wrote: ↑
Fri Jul 09, 2021 11:30 am
 If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution, what percentage of the original alcohol was replaced?

A. 3%
B. 20%
C. 66%
D. 75%
E. 80%

Answer: E

Source: GMAT Club Tests
Use Smart Numbers

Give \(100\) for the initial amount

Then you will have \(50-0.25x = 30 \Longrightarrow x=80\)

So \(\%\) is \(\dfrac{80}{100}\) is \(80\%\)
Top
Post new topic Post Reply
• Page 1 of 1