If Robin typed 15 characters in 5 seconds, 30 characters in 10 seconds, and 45 characters in 15 seconds, how many characters do you think she would
type in 20 seconds?

A. 50
B. 35
C. 90
D. 60

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3