Koby can work about 22 math problems in 30 minutes. At this rate, how many math problems can Koby work in 3 hours

So 22 problems / 30 minutes = ? problems / 180 minutes

so you basically just convert them

and you will times 30 by 6 to get 180, so you times 22 by 6

and you will get 132 problems

so Koby can do 132 problems