Select the real-world problem that could be solved using a proportion. 1. Sheila has 2 dogs and adopts 1 more. How many dogs does she have in total?
2. Sheila travels 120 miles in 2 hours. At this rate, how far will she travel in 6 hours?
3. Sheila has 2 pens and 6 pencils. How many more pens does she need to make the number of pens and pencils she has equivalent?
4.Sheila must pay $120 for a phone and then $60 each month for service. How much will she have paid after 6 months?