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OpenStudy (anonymous):
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?
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OpenStudy (anonymous):
Jim is 15 years old
OpenStudy (anonymous):
j * 4 = d j + 10 = d2 + 20
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