math

A student has passed 60 percent of the 20 quizzes he has written so far successfully. If the student writes 50 quizzes during the year, and passes 80 percent of the remaining quizzes successfully, what would his average percentile be?

same with this one

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  1. A student has passed 60 percent of the 20 quizzes he has written so far successfully mean:

    successfully quizzes = 60 % of 20 quizzes = ( 60 / 100 ) * 20 = 60 * 20 / 100 = 1200 / 100 = 12

    The remaining quizzes = 50 - 20 = 30 quizzes

    80 percent of the remaining quizzes successfully mean:

    The remaining successfully quizzes = 80 % of 30 = ( 80 / 100 ) * 30 = 80 * 30 / 100 = 2400 / 100 = 24

    Total successfully quizzes = 12 + 24 = 36

    Average = ( 36 / 50 ) * 100 % = 0.72 * 100 % = 72 %

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  2. The ratio of the number of Mimi’s Eminem CD’s to the number of Rita’s Eminem CD’s is 5:8. Rita has 18 more Eminem CD’s than Mimi. If Rita gives 22 CD’s to Mimi, what will be the new ratio of the number of Mimi’s Eminem CD’s to Rita’s?

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  3. thank you!

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  4. 72%

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  5. 72%

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  6. thx

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