Mary今年12岁,2年前她的年纪比她弟弟Jeck的2倍,今年Jeck几岁?
2年前Mary 12-2=10岁,10除以2=5岁（Jeck2年前岁数）,今年5+2=7岁
Jeck is 7 yearls old now.
Mary is 12 years old.Two years ago,she was twice as old as h
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