Solve the problem, if possible. Round your answer to the nearest tenth, when appropriate.
-A book has pages that are $16 \mathrm{~cm}$ by $20 \mathrm{~cm}$. The printed matter on a page of the book must cover $140 \mathrm{~cm}^{2}$. If all margins are to be the same width, how wide should the margins be?
A) $9 \mathrm{~cm}$
B) $12 \mathrm{~cm}$
C) $3 \mathrm{~cm}$
D) $2 \mathrm{~cm}$

Question

Quizplus · Accepted Answer

The printed matter on a page of the book must cover $140 \mathrm{~cm}^{2}$. So, the area of the margins is $16 \times 20 - 140 = 280 \mathrm{~cm}^{2}$. Since all margins are to be the same width, the width of each margin is $280 \div 4 = 70 \mathrm{~cm}$. Rounding to the nearest tenth, the width of the margins is $3 \mathrm{~cm}$.

Solve the Problem, If Possible 16 cm16 \mathrm{~cm}16 cm By 20 cm20 \mathrm{~cm}20 cm the Printed Matter on a Page of the Book

Solve the Problem, If Possible $16 \mathrm{~cm}$ By $20 \mathrm{~cm}$ the Printed Matter on a Page of the Book