Question

Un motociclist are de parcurs o distanta de 580 km in trei zile. Daca in prima zi a parcurs cu 73 km mai mult decat in a doua zi, iar in a treia zi cu 57 km mai mult decat in a doua zi, calculati cati km a parcurs in fiecare zi.

Answer 1

a+b+c=580km
a=b+73km
c=b+57km
a=?
b=?
c=?

b+73km+b+b+57km=580km
3b+130km=580km
3b=580km-130km
3b=450km
b=450km:3
b=150(km a parcurs in a doua zi)
a=150km+73km
a=223(km a parcurs in prima zi)
c=150km+57km
c=207(km a parcurs in a treia zi)

Answer 2

a+b+c=580 km.
a=b+73
c=b+57
b+73+b+b+57=580 km
3b=580-73-57=450
b=450:3
b=150 km. a parcurs a doua zi
a=150+73
a=223 km. a parcurs in prima zi 
c=150+57
c=207 km. a parcurs  a treia zi
V: 223+150+207=580 km.