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The average (arithmetic mean) of 3a + 4 and another number is 2a. What

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The average (arithmetic mean) of 3a + 4 and another number is 2a. What  [#permalink]

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New post 14 Oct 2019, 23:42
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A
B
C
D
E

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Question Stats:

75% (01:18) correct 25% (01:41) wrong based on 35 sessions

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The average (arithmetic mean) of 3a + 4 and another number is 2a. What  [#permalink]

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New post 15 Oct 2019, 00:33
Bunuel wrote:
The average (arithmetic mean) of 3a + 4 and another number is 2a. What is the average of the other number and a ?

A. 2a
B. a - 4
C. a - 2
D. a + 2
E. a + 4


Let the other number be x. \(\frac{(3a + 4) + x}{2} = 2a\) -> \(x = 4a - 3a - 4\) -> \(x = a - 4\)

Therefore, the average of a and a - 4 is \(\frac{a + (a - 4)}{2} = \frac{2a - 4}{2} = a-2\) (Option B)
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The average (arithmetic mean) of 3a + 4 and another number is 2a. What   [#permalink] 15 Oct 2019, 00:33
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The average (arithmetic mean) of 3a + 4 and another number is 2a. What

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