Before expansion, a zoo had 343 birds in 7 cages. If, after

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

Redeem

This topic has expert replies

Post new topic Post Reply

Previous Topic Next Topic

BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pm; Followed by:23 members

Before expansion, a zoo had 343 birds in 7 cages. If, after

by BTGmoderatorDC » Thu Dec 27, 2018 6:58 pm

Timer

00:00

Your Answer

Global Stats

Before expansion, a zoo had 343 birds in 7 cages. If, after the expansion was complete, there were 719 birds in 11 cages, what was the approximate percent increase in the average number of birds per cage?

a. 11%

b. 15%

c. 24%

d. 33%

e. 50%

OA D

Source: Princeton Review

Quote

Source: Beat The GMAT — Problem Solving | Thu Dec 27, 2018 6:58 pm

GMAT/MBA Expert

[email protected]: Elite Legendary Member; Posts: 10392; Joined: Sun Jun 23, 2013 6:38 pm; Location: Palo Alto, CA; Thanked: 2867 times; Followed by:511 members; GMAT Score:800

by [email protected] » Sat Dec 29, 2018 11:00 am

Hi All,

We're told that BEFORE expansion, a zoo had 343 birds in 7 cages and AFTER the expansion was complete, there were 719 birds in 11 cages. We're asked for the approximate percent increase in the average number of birds per cage. This question is based around a couple of standard math Formulas: the Average Formula and Percent Change Formula.

Before the expansion, the average birds/cage was 343/7 = 49 birds/cage
After the expansion, the average birds/cage was 719/11 = approximately 65 birds/cage

The percent increase in birds/cage = (new - old)/(old) = (65 - 49)/49 = 16/49 = approximately 1/3 = approximately 33 1/3%

Final Answer: D

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

Quote

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8083; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

by Scott@TargetTestPrep » Sun Mar 10, 2019 6:45 pm

BTGmoderatorDC wrote:Before expansion, a zoo had 343 birds in 7 cages. If, after the expansion was complete, there were 719 birds in 11 cages, what was the approximate percent increase in the average number of birds per cage?

a. 11%

b. 15%

c. 24%

d. 33%

e. 50%

OA D

Source: Princeton Review

The average number of birds per cage after the expansion was 719/11 â‰ˆ 65, and before the expansion, the average number of birds per cage was 343/7 = 49.

We use the percent increase formula: (New - Old)/Old x 100. So the percent increase is:

(65 - 49)/49 x 100

Rounding 49 to 50, we have:

(65 - 50)/50 x 100

(65 - 50) x 2 = 30 percent, which is closest to 33%.

Answer: D

Scott Woodbury-Stewart
Founder and CEO
[email protected]