If 75 percent of all Americans own an automobile, 15 percent of all Americans own a bicycle, and 20 percent of all Americans own neither an automobile nor a bicycle, what percent of Americans own both an automobile and a bicycle?
(A) 0%
(B) 1.33%
(C) 3.75%
(D) 5%
(E) 10%
[spoiler]OA=E[/spoiler]
Source: Princeton Review
If 75 percent of all Americans own an automobile, 15 percent of all Americans own a bicycle, and 20 percent of all
This topic has expert replies
Given: 75 percent of all Americans own an automobile, 15 percent of all Americans own a bicycle, and 20 percent of all Americans own neither an automobile nor a bicycle
Seeking: We want to know what percent of Americans own both an automobile and a bicycle
Formula: 100% = % own Automobile + % own Bicycle + %own neither an automobile nor a bicycle - % own both Automobile and Bicycle
Solution: 100% = 75 + 15 + 20 - % own both Automobile and Bicycle
=> 100 = 110 - % own both Automobile and Bicycle
=> % own both Automobile and Bicycle = 10
Answer: E
Seeking: We want to know what percent of Americans own both an automobile and a bicycle
Formula: 100% = % own Automobile + % own Bicycle + %own neither an automobile nor a bicycle - % own both Automobile and Bicycle
Solution: 100% = 75 + 15 + 20 - % own both Automobile and Bicycle
=> 100 = 110 - % own both Automobile and Bicycle
=> % own both Automobile and Bicycle = 10
Answer: E
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Because we are dealing with percentages, we can say that there are 100 Americans. 100 is a great number to pick because it makes our math easy.
Let's break it down:
We are told that 75% of Americans have an automobile...so 75 people have an auto
That means that 25% don't have an automobile...so 25 people don't have an auto
We are also told that 15% of Americans own a bike...so 15 people own a bike
And we are told that 20% of Americans neither own a bike or an auto...so 20 people own neither
Because 25 people own a bike and 20 people own neither, that means 5 people own a bike but not an auto (25-20). And because we know that a total of 15 people own a bike, that means that 10 people must own a bike AND a car (15-5). Since we said that there were originally 100 Americans, 10/100 = 10%
Answer choice E
Let's break it down:
We are told that 75% of Americans have an automobile...so 75 people have an auto
That means that 25% don't have an automobile...so 25 people don't have an auto
We are also told that 15% of Americans own a bike...so 15 people own a bike
And we are told that 20% of Americans neither own a bike or an auto...so 20 people own neither
Because 25 people own a bike and 20 people own neither, that means 5 people own a bike but not an auto (25-20). And because we know that a total of 15 people own a bike, that means that 10 people must own a bike AND a car (15-5). Since we said that there were originally 100 Americans, 10/100 = 10%
Answer choice E
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Given that 20 percent of all Americans own neither an automobile nor a bicycle, we know that 80% percent of all Americans own either an automobile or a bicycle.Vincen wrote: ↑Tue Jun 02, 2020 7:22 amIf 75 percent of all Americans own an automobile, 15 percent of all Americans own a bicycle, and 20 percent of all Americans own neither an automobile nor a bicycle, what percent of Americans own both an automobile and a bicycle?
(A) 0%
(B) 1.33%
(C) 3.75%
(D) 5%
(E) 10%
[spoiler]OA=E[/spoiler]
Source: Princeton Review
Thus, percent of Americans own both an automobile and a bicycle = 75 + 15 – 80 = 10%
The correct answer: E
Hope this helps!
-Jay
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Solution:Vincen wrote: ↑Tue Jun 02, 2020 7:22 amIf 75 percent of all Americans own an automobile, 15 percent of all Americans own a bicycle, and 20 percent of all Americans own neither an automobile nor a bicycle, what percent of Americans own both an automobile and a bicycle?
(A) 0%
(B) 1.33%
(C) 3.75%
(D) 5%
(E) 10%
[spoiler]OA=E[/spoiler]
We can let the total number of Americans = 100 and create the following equation:
100 = number who own an automobile + number who own a bike - number who own both + number who own neither
100 = 75 + 15 - b + 20
100 = 110 - b
b = 10
Answer: E
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