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Erica read 160 pages of her book. if she is 40% of the way done, how many pages are there in the whole book?

 Apr 2, 2020
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If 160 pages are 40% of the book 

then x pages are 100% of the book

Thus in ratio form:

\(160:40\)%

\(x:100%\)%

Same as:

 \(\frac{160}{0.4}=\frac{x}{1}\)

\(x=\frac{160}{0.4}=400 pages\)

.
 Apr 2, 2020
edited by Guest  Apr 2, 2020

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