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# What is the average (arithmetic mean) of 2x and 6y ?

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Math Expert
Joined: 02 Sep 2009
Posts: 51100
What is the average (arithmetic mean) of 2x and 6y ?  [#permalink]

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18 Jan 2018, 07:07
00:00

Difficulty:

15% (low)

Question Stats:

75% (00:49) correct 25% (01:27) wrong based on 68 sessions

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What is the average (arithmetic mean) of 2x and 6y ?

(1) x + y = 18
(2) x + 3y = 32

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Re: What is the average (arithmetic mean) of 2x and 6y ?  [#permalink]

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18 Jan 2018, 07:18
B.

from question stem we need to find (2x+6y)/2 i.e., x+3y.

A. clearly insufficient

B. directly gives the answer. sufficient
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Re: What is the average (arithmetic mean) of 2x and 6y ?  [#permalink]

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16 Jul 2018, 23:17
Bunuel wrote:
What is the average (arithmetic mean) of 2x and 6y ?

(1) x + y = 18
(2) x + 3y = 32

Question :

2x + 6y/ 2 = ?

Say, 2x + 6y / 2 = k

2(x + 3y) = 2k

x + 3y = k , then what is "k"

St 1: Not sufficient as there are infinite values for this equation.

St 2: Sufficient : Directly answers k = 32

(B)
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Re: What is the average (arithmetic mean) of 2x and 6y ? &nbs [#permalink] 16 Jul 2018, 23:17
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