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Camille's average on her 6 math tests this marking period is : Multiple-choice Questions — Select One Answer Choice

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Re: Camille's average on her 6 math tests this marking period is [#permalink]
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Carcass wrote:

This question is part of GREPrepClub - The Questions Vault Project



Camille's average on her 6 math tests this marking period is 75. Fortunately for Camille, her teacher drops each student's lowest grade, and this raises her average to 85.What was her lowest grade?

A) 20

B) 25

C) 30

D) 40

E) 50


We know that the sum of her scores is 6 x 75 = 450. From this total, one score (let’s call it n) will be dropped, leaving (450 - n) as the new sum. We know that because of the dropped score that the new average is calculated with the 5 remaining scores, and the new average is 85. We can create the equation:

[(6 x 75) - n]/5 = 85

450 - n = 425

25 = n

Answer: B
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Re: Camille's average on her 6 math tests this marking period is [#permalink]
1st Average: (Camile Total)/6 =75
2nd Average: (Camile Total)/5 - X =85

-X=(85*5)-(75*6)
x=25
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Re: Camille's average on her 6 math tests this marking period is [#permalink]
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