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In calvin’s chemistry class, her final grade

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Intern
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Joined: 31 Jul 2016
Posts: 10
In calvin’s chemistry class, her final grade  [#permalink]

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New post 06 Mar 2019, 08:56
1
3
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A
B
C
D
E

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
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Joined: 15 Dec 2018
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Concentration: Finance
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Re: In calvin’s chemistry class, her final grade  [#permalink]

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

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Joined: 21 Feb 2019
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In calvin’s chemistry class, her final grade  [#permalink]

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

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

\(80 * 2 + x = 225\)

\(x = 225 -160 = 65\)

Correct answer is A.

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

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