Question

Bob reads 1/2 of a 200 page book in 4 days. How long would it take him to read 600 page book

Answer 1

24 days

1) Consider that Bob reads at a regular pace. So, we can write out a pair of ratios. Note that if Bob reads half of a 200 pages book so he does 100 pages in 4 days

`\begin{gathered} pages--------days \\ 100---------4 \\ 600---------x \end{gathered}`

2) So writing out a pair of ratios we have:

`(100)/(600)=(4)/(x)`

Now, we can cross multiply them:

`\begin{gathered} 100x=600\cdot4 \\ 100x=2400 \\ (100x)/(100)=(2400)/(100) \\ x=24 \end{gathered}`