Question

A printer takes 7 minutes to print a document with 63 pages. How many pages

Answer 1

Create a proportion.

Since it takes 7 minutes to print 63 pages, and half an hour is 30 minutes, you create two ratios(unit per unit) and line up the units(minutes to minutes, pages to pages).

$\frac{7 min}{63 pages} = \frac{30 min}{Xpages}$

Now you cross multiply, 63 * 30 = 1890 and 7 * x = 7x.

So we have 1890 = 7x.

Then we divide both sides by seven.

$\frac{1890}{7} = \frac{7x}{7}$

270 = x, therefore you can print 270 pages in half an hour :)