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Four years ago Jane was twice as old as Sam.

2022-08-01 22:20:32 问答库阅读 167 次

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Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane"s age. How old is Jane now？请帮忙给出正确答案和分析，谢谢！

正确答案：12 years old
12 years old 解析：设Jane现在是x岁，Sam现在是y岁，根据题意可得下列议程式：x-4=2 (y-4)；3/4(x+4)=y+4得x=12，所以Jane现在是12岁。