maths urgent
posted by Mayyday on .
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)

1/5 J= 1/3 S
JS=1/2 A
S+120=J
Well, looking at the last equations, it is obvious that JS=120
then A=240
JS=120
3J5S=0 From first equation.
3J3S=360
3J5S=0
2S=360
S=180
finally, J=300
Sum them up.