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The average (arithmetic mean) of a, 2a, and 9 is 7
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10 Jun 2017, 02:06
10 Jun 2017, 02:06
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88% (00:29) correct
11% (00:30) wrong based on 134 sessions
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The average (arithmetic mean) of a, 2a, and 9 is 7
Quantity A |
Quantity B |
5 |
a |
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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Re: The average (arithmetic mean) of a, 2a, and 9 is 7
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30 Jul 2017, 17:35
30 Jul 2017, 17:35
1
Carcass wrote:
The average (arithmetic mean) of a, 2a, and 9 is 7
Quantity A |
Quantity B |
5 |
a |
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.
The average (arithmetic mean) of a, 2a, and 9 = 7
So, (a + 2a + 9)/3 = 7
Multiply both sides by 3 to get: a + 2a + 9 = 21
Simplify: 3a + 9 = 21
Solve: a = 4
So, we have:
Quantity A: 5
Quantity B: 4
Answer: A
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Re: The average (arithmetic mean) of a, 2a, and 9 is 7
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27 Dec 2021, 02:57
27 Dec 2021, 02:57
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