Mr. Yoshi has 75 papers. He graded 60 papers, and he had a student teacher grade the rest, what percent of the papers did each person grade?

2 Answers
Suren Abreu
Nov 20, 2016

Mr Yoshi graded 80% of the papers and the student teacher graded the remaining 20%.

Explanation:

To determine the percentage of 60 out of 75 papers, we write the equation:

75xxx/100=60

3cancel(75)xxx/(cancel(100)4)=60

Multiply both sides by 4/3.

x=60xx4/3

x=20cancel(60)xx4/(cancel(3)1)

x=80

Since Mr Yoshi graded 80% of the papers, the balance is (100-80)=20%.

EZ as pi
Nov 20, 2016

Mr Yoshi graded 80% and the student teacher 20%

Explanation:

To express one quantity as a percent of another:

"fraction" xx 100%

Mr Yoshi graded 60/75 papers

the student teacher graded 15/75 papers

As percentages:

60/75 xx100%" "15/75 xx100%

=4/5 xx 100%" "=1/5 xx100%

=80%" "=20%

80% + 20%= 100%

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