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?
a. D = 4J and D + 10 = 2J + 20
b. D = 4J and D + 10 = 2 (4J + 10) + 20
c. D = 4J and D + 10 = 2 (J + 10) + 20
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