Question

20 pens for $1.60 or 25 pens for $2.25

Write a rate for each
Write each rate as a unit rate
Which is better to buy

Answer 1

20 pen for 1.60

Explanation:

Because the rate of 1.60 is less then the rate from 25 wich is only 5 more pens and 1 more dollar so 20 pens for 1.60

Answer 2

The 20 pens for 1.60 is better because the unit rate is cheaper