Jeffery typed 110 words in 2 3/4 minutes. At this rate, how many words can he type in 4 1/4 minutes

change the mixed numbers to improper factions

2 3/4 = (4*2+3) / 4 = 11/4

4 1/4 = (4*4+1) / 4 = 17/4

110 divided by 11/4

copy dot flip

110 * 4/11 = 40 words per minute

40 word per minute * 17/4 minutes

170 words