Dad is 4 times as old as his son Jim. In 10 years, Dad's age will be 20 years more than twice Jim's age. How old is Jim? If D = dad's age now and J = Jim's age now, which of the following systems could be used to solve the problem?
D = 4J and D + 10 = 2J + 20
D = 4J and D + 10 = 2(4J + 10) + 20
D = 4J and D + 10 = 2(J + 10) + 20