Hall looked at 10 websites every 35 hours. At this rate, how long, in hours, will it take to look at

Hall looked at 10 websites every 35 hours. At this rate, how long, in hours, will it take to look at 6 websites?

Set up a proportion of websites to hours where h is the number of hours it takes to look at 6 websites:
10/35 = 6/h

To solve this proportion for h, we type it in our math engine and we get:
h = 21 hours