Four years ago ,Jane was twice as old as Sam.Four years in from now,Sam will be 3/4 of Jane's age.
2个回答
2012-04-22
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Four years ago :sam x jane 2x
now: sam x+4 jane 2x+4
Four years in from now: sam x+8 jane 2x+8
(2x+8)*3/4=x+8
6x+24=4x+32
2x=8
x=4
now: jane 2x+4=12
now: sam x+4 jane 2x+4
Four years in from now: sam x+8 jane 2x+8
(2x+8)*3/4=x+8
6x+24=4x+32
2x=8
x=4
now: jane 2x+4=12
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