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In calvin’s chemistry class, her final grade consists of lab work and
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14 Sep 2021, 02:04
14 Sep 2021, 02:04
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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%
A)65%
B)68%
C)70%
D)73%
E)75%
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Re: In calvin’s chemistry class, her final grade consists of lab work and
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14 Sep 2021, 06:45
14 Sep 2021, 06:45
1
Carcass wrote:
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%
A)65%
B)68%
C)70%
D)73%
E)75%
Weighted average of groups combined = (group A proportion)(group A average) + (group B proportion)(group B average) + (group C proportion)(group C average) + ...
So, here we have: Final grade = (lab work weighting)(lab work grade) + (final exam weighting)(final exam grade)
Let x = final exam grade
Plug in values to get: 75 = (2/3)(80) + (1/3)(x)
Simplify: 75 = 160/3 + x/3
Multiply both sides by 3 to get: 225 = 160 + x
Solve: x = 65
Answer: A
Cheers,
Brent
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Re: In calvins chemistry class, her final grade consists of lab work and
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07 Mar 2023, 06:47
07 Mar 2023, 06:47
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
