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Average of x and 2y

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Intern
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B
Joined: 22 May 2016
Posts: 7
Average of x and 2y  [#permalink]

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New post 28 Jan 2019, 19:00
It is a conceptual question:

If the question says that average of x and 2y is 10, does this mean:

Option#1. (x + 2y)/2 = 10
OR
Option#2. (x + 2y)/3 = 10

This concept is used in OGQR 18 Q194. The solution uses Option#1. However, I believe it should be Option#2 because we have three terms: x,y, and y.
i.e. the above equation can be re-written as (x+y+y)/3 = 10.
Intern
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Joined: 17 Jan 2019
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Re: Average of x and 2y  [#permalink]

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New post 28 Jan 2019, 19:36
So in culculating the average height of two guys of 160cm and 170cm, will you claim
“Hey, a 170cm guy is equivalent to two 85cm kids, so let’s rip this guy in half and make it (160+85+85)/3=110cm!” or simply calculate “(160+170)/2=165cm”?

Don’t arbitrarily devide “2y” into two “y”s.
Devide the total by the number of items.

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Re: Average of x and 2y   [#permalink] 28 Jan 2019, 19:36
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