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# In calvin’s chemistry class, her final grade

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Intern
Joined: 31 Jul 2016
Posts: 10

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06 Mar 2019, 08:56
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Difficulty:

25% (medium)

Question Stats:

77% (02:15) correct 23% (02:01) wrong based on 43 sessions

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In calvin’s chemistry class, her final grade consists of lab work and the final exam. If lab work is 2/3 of the final grade, and she scores 80%, what must she score on the final exam to earn a final grade of 75%?

A)65%

B)68%

C)70%

D)73%

E)75%
Intern
Joined: 15 Dec 2018
Posts: 10
Concentration: Finance

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06 Mar 2019, 09:36
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80+80+X= (75*3)
X=65

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Manager
Joined: 21 Feb 2019
Posts: 125
Location: Italy

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06 Mar 2019, 09:51
1
Consider percent values as integers (you can do it because all values are in percentage).

$$75 = \frac{2}{3}80 + \frac{1}{3}x$$

$$80 * 2 + x = 225$$

$$x = 225 -160 = 65$$

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In calvin’s chemistry class, her final grade   [#permalink] 06 Mar 2019, 09:51
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