Question

trei frati au impreuna 360 lei aflati cat are fiecare copil stiind ca primul are cat ceilalti doi impreuna iar al doilea cu 40 lei mai mult decat al treilea

Answer 1

a+b+c=360 lei
a=b+c
b=40+c...=> a=40+c+c...=> a=2c+40

2c+40+40+c+c=360
4c+80=360
4c=360-80
4c=280
c=280:4
c=70
b=70+40
b=110
a=110+70
a=180

180+110+70=
=290+70
=360

Answer 2

x+y+z=360
x=y+z
y=z+40 → x=z+40+z

z+40+z+z+40+z=360
4 z=360-40-40
4 z=280
z=280:4
z=70
y=70+40=110
x=70+110=180