James And Jack
Algebra
Level
2
Three years ago James was 7 times that of Jack. Three years hence James age will be 4 times that that of jack 's age. What is present age of Jack?
10 years
9 years
5 years
7 years
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1 solution
let present ages be x & y then (x-3)=7(y-3) => x-7y=-18 and (x+3)=4(y+3) => x-4y=9 on soving y=9