A phone company surveys a sample of current customers to determine if they use their phones most often to text or use the Internet. They sort the data by payment plans, as shown below.

Plan A: 27 text, 21 Internet

Plan B: 13 text, 10 Internet

Answer the questions to determine a conditional probability.

How many customers are on payment plan B?

customers

How many of the customers on plan B text?

customers

What is the probability that a randomly selected customer who is on plan B uses the phone most often to text? Give the answer in fraction form.