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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):
consider x represents the age of mary and y represents the age of jane X= y - 14 y+4 = 3 (x+4) subtitute first eqn in the second y+4 = 3(y - 10) solving it y + 4 = 3y - 30 2y = 34 y = 17
OpenStudy (anonymous):
oh thanks
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