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The ratio of two adult brothers' ages is 5 to 8.

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The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   05 Nov 2017, 01:04
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The ratio of two adult brothers' ages is 5 to 8.


Quantity A
Quantity B
The ratio of the brothers' ages 8 years ago.
The ratio of the brothers' ages in 6 years.


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
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B
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IlCreatore
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   05 Nov 2017, 02:50
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Whatever ages we decide to use, with the only restriction of being both greater than 8 (otherwise B would be negative and age cannot be negative), we get quantity B is greater.
For example, if the ages were 10 and 16 (2*5 and 2*8), quantity A would be 2/8 and quantity B 4/10, thus B is greater.

Answer B
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   24 Feb 2018, 09:56
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we can compare a/b and (a-1)/(b-1) to see the logic behind this type of question.
assume a and b >1:
a/b ? a-1/b-1 =a(b-1)?b(a-1)=ab-a?ba-b=-a?-b
When a is smaller than b: -a>-b the one close to original number is larger.
When a is smaller than b: -a<-b the one further from the original number is larger.
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   24 Feb 2018, 17:08
B
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   17 Dec 2020, 15:24
Since the question states 2 "ADULT" brothers, shouldn't their ages be at least 18?
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   17 Dec 2020, 15:40
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Skvasan wrote:
Since the question states 2 "ADULT" brothers, shouldn't their ages be at least 18?


Yes correct assumption
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   17 Dec 2020, 19:43
Adult likely implies these bros are over the age of 8 so we can rule out D.

If we understand what a ratio is, we don't have to think long about this. As time goes on, age gaps become less of a difference. What does that mean? Age ratio is going to 1.

Now with how the problem is worded are we starting above 1 or below 1? We're starting below 1. Therefore B will be greater than A.
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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink] New post   12 Aug 2022, 03:16
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The ratio of two adult brothers' ages is 5 to 8. [#permalink]
12 Aug 2022, 03:16
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