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

Redeem

Last year Jenny was 5 feet tall, and this year she is

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

Last year Jenny was 5 feet tall, and this year she is

by VJesus12 » Mon May 14, 2018 1:19 am
Last year Jenny was 5 feet tall, and this year she is 5 feet 6 inches. What is the percent increase of her height?
(1 foot = 12 inches)

(A) 5%
(B) 10%
(C) 15%
(D) 20%
(E) 40%

The OA is the option B.

What is the equation that I should use here? I got confused with the inches. <i class="em em-disappointed"></i>. Please, someone help me.
Top
Source: — Problem Solving |
Legendary Member
Posts: 2898
Joined: Thu Sep 07, 2017 2:49 pm
Thanked: 6 times
Followed by:5 members

by Vincen » Mon May 14, 2018 2:29 am
Hello vjesus12.

Let's make the conversion:

1 foot = 12 inches.

Now
- If Jenny was 5 feet tall, then she was 5*12 = 60 inches tall.
- This year she is 5 feet 6 inches, then 5*12+6 = 66 inches tall.

Now, let's see what percent x is taller Jenny:

60 inches ---------- 100%
66 inches ---------- x %

Then $$x=\frac{66\cdot100}{60}=\frac{6600}{60}=110\ \%.$$ This tells us that now she is 10% taller.

Therefore, the percent increase was equal to 10%. Thus, the correct answer is the option B.

I hope it helps you.

Regards.
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16207
Joined: Mon Dec 08, 2008 6:26 pm
Location: Vancouver, BC
Thanked: 5254 times
Followed by:1268 members
GMAT Score:770

by Brent@GMATPrepNow » Mon May 14, 2018 5:57 am
VJesus12 wrote:Last year Jenny was 5 feet tall, and this year she is 5 feet 6 inches. What is the percent increase of her height?
(1 foot = 12 inches)

(A) 5%
(B) 10%
(C) 15%
(D) 20%
(E) 40%
Old height: 5 feet = 60 inches
New height: 5 feet 6 inches = 66 inches

Percent increase = (100)(new - old)/old
= (100)(66 - 60)/60
= (100)(6)/60
= 600/60
= 10%

Answer: B

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Legendary Member
Posts: 2499
Joined: Sun Oct 29, 2017 2:04 pm
Followed by:6 members

by swerve » Mon May 14, 2018 11:16 am
Height last year = 5*12 = 60 inches
Increase this year 6 inches

Required % = 6/60 * 100 = 10%

Hence the correct answer is B.
Top
User avatar
GMAT Instructor
Posts: 1462
Joined: Thu Apr 09, 2015 9:34 am
Location: New York, NY
Thanked: 39 times
Followed by:22 members

by Jeff@TargetTestPrep » Tue May 15, 2018 3:36 pm
VJesus12 wrote:Last year Jenny was 5 feet tall, and this year she is 5 feet 6 inches. What is the percent increase of her height?
(1 foot = 12 inches)

(A) 5%
(B) 10%
(C) 15%
(D) 20%
(E) 40%
Last year Jenny was 5 x 12 = 60 inches tall, and this year she's 60 + 6 = 66 inches tall. So the percent increase is:

(66 - 60)/60 x 100

6/60 x 100 = 1/10 x 100 = 10%

Answer: B

Jeffrey Miller
Head of GMAT Instruction
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews
Top
Post new topic Post Reply
• Page 1 of 1