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b- rowery starszych
a+b=61
b=61-a
3a+2b=147
3a+2(61-a)=147
3a+122-2a=147
a=25
a=61-25
a=36
spr. 2*36+3*25=72+75=147
y- rowery młodziezowe
x+y=61
3x+2y=147
x=61-y
3*(61-y)+2y=147
x=61-y
183-3y+2y=147
x=61-y
-y=147-183
x=61-y
-y=-36 /*(-1)
x=61-y
y=36
x=61-36
y=36
x=25
y=36
rowery dziecięce było 25 a młodzieżowych 36