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OpenStudy (anonymous):
giving medals 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
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OpenStudy (anonymous):
D=4J D+10 = 2J+20
OpenStudy (anonymous):
D+10 - Dad's age now +10 years ; 2*(J+10) = 2J+20 - Jim's age double in ten years
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