It takes mark 20 minutes to type and spell check 14 pages. find out how many pages he can type and spell check in 5.5 hours. round answers to the nearest tenth if necessary.

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Let's see how many pages he spellchecks in 1hrto start with, 
20min is 1/3 of an hr so multiply both numbers by 3
20*3=60min or 1hr
14*3=42
So he spell checks 42 pages in an hour now let's multiply that by 5.5
1hr*5.5=5.5hrs
42*5.5=231
He spellchecks 231 pages in 5.5 hrs

Use a calculator basically