Mathematics, 02.12.2020 20:20 tseaux9

Dad is 3 times as old as his son, Jim. In 20 years, Dad's age will be 2 years less 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 = 3J and D + 20 = 3J - 2
D = 3J and D + 20 = 2(3J + 20) - 2
D = 3J and D + 20 = 2(J + 20) - 2
D = 3J and D + 20 = 3J + 20 - 2

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