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Camille's average on her 6 math tests this marking period is

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Camille's average on her 6 math tests this marking period is [#permalink] New post 19 May 2017, 02:15
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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
[Reveal] Spoiler: OA

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Re: Camille's average on her 6 math tests this marking period is [#permalink] New post 22 Sep 2017, 06:05
Since the mean of 6 grades is 75, the sum of this grade is equal to 6*75 = 450. Then, we can check the answers by subtracting them from 450 and dividing by 5, the number of remaining grades. Since the answers are in increasing order we should start by answer C to have an idea of the direction in which we should move.

Using C, we would get (450-30)/5 = 84, too low. This means that we are subtracting a too high grade. Then, we should move up. Let's try with B.

Using B, we obtain (450-25)/5 = 85. Here we are. Answer B is the right one!
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Re: Camille's average on her 6 math tests this marking period is [#permalink] New post 29 Sep 2017, 06:49
avg=sum/no
6*75=450
after lowest grade dropped
5*85=425
450-425=25
answer B
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Re: Camille's average on her 6 math tests this marking period is [#permalink] New post 06 Jun 2018, 15:21
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Carcass wrote:


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] 06 Jun 2018, 15:21
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