Question

Mrs. Baca uses a phone card to call her relatives in Columbia. It costs her 45 cents to talk for 15 minutes. How long can she talk for 75 cents? (HINT: find the unit rate first.) *

Answer 1

Answer:

25 minutes.

Step-by-step explanation:

Unit rate = 45/15 = 3 cents / minute.

So she pays 3 cents for 1 minute

and for 75 cents  she can talk for 75 * 1/3  = 25 minutes.