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Khan Academy
Unit test
You might need: Calculator
Henry can write 5 pages of his novel in 3 hours.
At this rate, how many pages can Henry write in 8 hours?

Khan Academy $\newline$ Unit test $\newline$ You might need: Calculator $\newline$ Henry can write $5$ pages of his novel in $3$ hours. $\newline$ At this rate, how many pages can Henry write in $8$ hours?

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Solve proportions: word problems

Full solution

Q. Khan Academy

\newline

Unit test

\newline

You might need: Calculator

\newline

Henry can write

5

pages of his novel in

3

hours.

\newline

At this rate, how many pages can Henry write in

8

hours?

Find Rate of Writing: First, find Henry's rate of writing pages per hour. $\newline$ Rate = $\frac{\text{Pages}}{\text{Time}}$ $\newline$ Rate = $\frac{5 \text{ pages}}{3 \text{ hours}}$ $\newline$ Rate = $1.6667$ pages per hour (rounded to four decimal places)
Calculate Pages in $8$ Hours: Next, calculate how many pages Henry can write in $8$ hours at this rate. $\newline$ Pages in $8$ hours $= \text{Rate} \times \text{Time}$ $\newline$ Pages in $8$ hours $= 1.6667 \text{ pages/hour} \times 8 \text{ hours}$ $\newline$ Pages in $8$ hours $= 13.3336 \text{ pages}$
Round Down to Nearest Page: Since Henry can't write a fraction of a page, we'll round down to the nearest whole page. Henry can write $13$ pages in $8$ hours.

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