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John got scores of x, x + 3, and x + 5 on his first three tests this

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John got scores of x, x + 3, and x + 5 on his first three tests this  [#permalink]

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New post 12 May 2017, 04:13
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John got scores of x, x + 3, and x + 5 on his first three tests this term. He then scored y, y + 2, y – 6, and y – 4 on the next four tests. Which of the following is his average (arithmetic mean) for all seven tests, in terms of x and y?

A. (3x + 4y)/7

B. (x + y)/7

C. (3x + 4y + 6)/7

D. (3x + 8)/3 + (4y - 8)/4

E. (x + 8)/3 + (y - 8)/4

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Re: John got scores of x, x + 3, and x + 5 on his first three tests this  [#permalink]

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New post 12 May 2017, 04:17
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Bunuel wrote:
John got scores of x, x + 3, and x + 5 on his first three tests this term. He then scored y, y + 2, y – 6, and y – 4 on the next four tests. Which of the following is his average (arithmetic mean) for all seven tests, in terms of x and y?

A. (3x + 4y)/7

B. (x + y)/7

C. (3x + 4y + 6)/7

D. (3x + 8)/3 + (4y - 8)/4

E. (x + 8)/3 + (y - 8)/4



Sum of scores of 1st 3 tests = 3x + 8
Sum of scores of next 4 tests = 4y - 8

Average of all 7 tests (3x+8 +4y-8)/7 = (3x+4y)/7


Answer A.

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Re: John got scores of x, x + 3, and x + 5 on his first three tests this  [#permalink]

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New post 19 Jul 2018, 21:55
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Re: John got scores of x, x + 3, and x + 5 on his first three tests this &nbs [#permalink] 19 Jul 2018, 21:55
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