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At the beginning of the school year, Lisa's goal was to earn an A on

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At the beginning of the school year, Lisa's goal was to earn an A on  [#permalink]

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New post 24 Mar 2019, 22:45
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A
B
C
D
E

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Question Stats:

86% (01:03) correct 14% (00:31) wrong based on 7 sessions

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At the beginning of the school year, Lisa's goal was to earn an A on at least 80% of her 50 quizzes for the year. She earned an A on 22 of the first 30 quizzes. If she is to achieve her goal, on at most how many of the remaining quizzes can she earn a grade lower than an A?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

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Re: At the beginning of the school year, Lisa's goal was to earn an A on  [#permalink]

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New post 25 Mar 2019, 00:56
Bunuel wrote:
At the beginning of the school year, Lisa's goal was to earn an A on at least 80% of her 50 quizzes for the year. She earned an A on 22 of the first 30 quizzes. If she is to achieve her goal, on at most how many of the remaining quizzes can she earn a grade lower than an A?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5


<30 seconds ..

total = 50 quizes ; 80% = 40 quizes to get A
she gets A in 22 of 30
so left A = 40-22 ; 18
left quizes = 50-30 = 20
so she can score any grade except A in 20-18 ; 2 quiz
IMO B
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Re: At the beginning of the school year, Lisa's goal was to earn an A on   [#permalink] 25 Mar 2019, 00:56
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At the beginning of the school year, Lisa's goal was to earn an A on

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