maths urgent

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1/5 of J's money is equal to 1/3 of S's money. The difference in their amount is 1/2 of A's money. If Adam gives $120 to S, S will have the same amount of money as J. How much do the 3 people have altogether?(please show me a model method, not algebra)

  • maths urgent -

    1/5 J= 1/3 S
    J-S=1/2 A

    S+120=J

    Well, looking at the last equations, it is obvious that J-S=120

    then A=240

    J-S=120
    3J-5S=0 From first equation.

    3J-3S=360
    3J-5S=0
    2S=360
    S=180
    finally, J=300

    Sum them up.

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