The larger of two numbers is 15 more than three time the smaller number. if the sum of the two numbers is 63 find the two numbers.

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.