Soni, Ara, and Caty are making cookies. So far, Soni made 50 cookies. Ara made 40. Caty made 70. Write the sum of cookies out of 100. If the sum is over 100, create a mixed number. Simply it to it's the lowest term.
(50/100 + 40/100 + 70/100 = 160/100 -> 1 60/100 / 20/20 = 1 3/5.)
