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OpenStudy (anonymous):
Mary is 14 years younger than her sister Jane. In four years, Jane will be 3 times older than Mary. How old is Jane now? 3 7 17 21
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OpenStudy (anonymous):
21
OpenStudy (anonymous):
thank you
OpenStudy (anonymous):
Just a note, M=J−14 J+4=3(M+4)
OpenStudy (anonymous):
It's actually just systems of equations "complexified" into a word problem.
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