z - zosia
a - adam
t- tomek
z+a+t=147
z=a+13
a=t+25
z=t+25+13
z=t+38
t+38+a+t=147
2t+a=109
2t+t+25=109
3t=84
t=28
a=28+25=53
z=53+13=66
zosia ma 66zł, adam 53zł, a tomek 28zł
x- pieniądze Adama
x+13 - pieniądze Zosi
x-25 - pieniądze Tomka
x+(x+13)+(x-25)=147
3x-12=147
3x=159
x =53
Zosia: 53+13= 66
Tomek: 53-25=28
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z - zosia
a - adam
t- tomek
z+a+t=147
z=a+13
a=t+25
z=t+25+13
z=t+38
t+38+a+t=147
2t+a=109
a=t+25
2t+t+25=109
3t=84
t=28
a=28+25=53
z=53+13=66
zosia ma 66zł, adam 53zł, a tomek 28zł
x- pieniądze Adama
x+13 - pieniądze Zosi
x-25 - pieniądze Tomka
x+(x+13)+(x-25)=147
3x-12=147
3x=159
x =53
Zosia: 53+13= 66
Tomek: 53-25=28