Question

Robin's Physics book has 120 pages. His Chemistry book has
10% more pages and Biology book has 10% less pages. If in
frustration Robin tears roughly 5%, 10% and 15% of pages in
Physics, Chemistry and Biology books respectively, then what
percentage of pages does he tear out?​

Answer 1

Answer:

Total pages torn= 35

Total No. of pages=360

35/360*100=9.7%

I hope it can help you ❤️❤️

Answer 2

The percentage of pages that he has torn is 9.833%

Given,

Pages in Physics Book = 120 pages

Pages in Chemistry Book = 10% more than Physics book

Pages in Biology Book = 10% less than Physics book

Pages Torn → 5% of Physics + 10% of Chemistry + 15% of Biology

To Find,

Percentage of pages torn

Solution,

Pages in Chemistry Book = 10% more than Physics book

Pages in Chemistry Book = 10% of 120 + 120

Pages in Chemistry Book = $\frac{10*120}{100}$ + 120 = 12 + 120

Pages in Chemistry Book = 132 pages

Pages in Biology Book = 10% less than Physics book

Pages in Biology Book = 120 - 10% of 120

Pages in Biology Book = 120 - $\frac{10*120}{100}$ = 120 - 12

Pages in Biology Book = 108 pages

Pages Torn → 5% of Physics + 10% of Chemistry + 15% of Biology

Pages Torn → 5% of 120 + 10% of 132 + 15% of 108

Pages Torn → $\frac{5*120}{10}$ + $\frac{10*132}{100}$ + $\frac{15*108}{100}$

Pages Torn → 6 + 13.2 + 16.2 = 35.4

Total number of pages = 120 + 132 + 108 = 360 pages

% of pages torn = $\frac{35.4}{360}$ * 100

% of pages torn = 9.833%

Thus, the percentage of pages that he has torn is 9.833%

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