GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
If the zoo currently has 80 total birds, what is the smalles
[#permalink]
19 Jul 2019, 02:10
19 Jul 2019, 02:10
Expert Reply
1
Bookmarks
00:00
Question Stats:
35% (01:42) correct
64% (02:17) wrong based on 39 sessions
Hide Show timer Statistics
Attachment:
#GREpracticequestion Approximately what percent of all the zoo’s animals.png [ 84.69 KiB | Viewed 5873 times ]
If the zoo currently has 80 total birds, what is the smallest number of birds that could be added such that at least 20% of the animals at the zoo would be birds?
(A) 10
(B) 80
(C) 100
(D) 125
(E) 200
Re: If the zoo currently has 80 total birds, what is the smalles
[#permalink]
25 Jul 2019, 18:53
25 Jul 2019, 18:53
1
1
Bookmarks
as 10% of birds=80, therefore, the total animals in the zoo ( 100%)=800.
Let's add X more birds to make the percentage of Birds AT LEAST 20 % of the total.
So, (80+x) is equal to or greater than 20% of ( 800+X)
80+x = 0.2(800+x)
80+x = 160+0.2x
-80= -0.8x
X=100
By calculation we get, X is greater than or equal to 100.
That is, if at least 100 birds are added, then we can get the desired percentage of bird population in the zoo.
Let's add X more birds to make the percentage of Birds AT LEAST 20 % of the total.
So, (80+x) is equal to or greater than 20% of ( 800+X)
80+x = 0.2(800+x)
80+x = 160+0.2x
-80= -0.8x
X=100
By calculation we get, X is greater than or equal to 100.
That is, if at least 100 birds are added, then we can get the desired percentage of bird population in the zoo.
Intern
Joined: 20 Jun 2021
Posts: 21
Given Kudos: 152
WE:Manufacturing and Production (Manufacturing)
If the zoo currently has 80 total birds, what is the smalles
[#permalink]
12 Oct 2021, 04:22
12 Oct 2021, 04:22
janani11 wrote:
as 10% of birds=80, therefore, the total animals in the zoo ( 100%)=800.
Let's add X more birds to make the percentage of Birds AT LEAST 20 % of the total.
So, (80+x) is equal to or greater than 20% of ( 800+X)
80+x = 0.2(800+x)
80+x = 160+0.2x
-80= -0.8x
X=100
By calculation we get, X is greater than or equal to 100.
That is, if at least 100 birds are added, then we can get the desired percentage of bird population in the zoo.
Let's add X more birds to make the percentage of Birds AT LEAST 20 % of the total.
So, (80+x) is equal to or greater than 20% of ( 800+X)
80+x = 0.2(800+x)
80+x = 160+0.2x
-80= -0.8x
X=100
By calculation we get, X is greater than or equal to 100.
That is, if at least 100 birds are added, then we can get the desired percentage of bird population in the zoo.
What would be the problem if we consider, There are a total of 100 birds. Thanks.
10+x = 0.2(100+x)
10+x = 20+0.2x
10= 0.8x
X=12.5
