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2 rate si 3 gaste costa 295lei ,iar3gaste si 5rate costa475lei .Cat costa o gasca ?
Cat costa o rata?

Răspuns :

Bebedumi70
2)        2)          2)
  3rate+5gaste =475lei    => 6rate +10gaste=950lei
3)        3)          3)
  2rate+3gaste =295lei    => 6rate + 9gaste =885lei

6r+10g=959 - (minus)
6r+  9g=885
------------------------------
=0r+1g=  65lei (costa o gasca)

2r+3g*65lei=295lei
2r+195lei=295lei
2r=295-195
2r=100
r=100:2
r=50lei (costa o rata)

verificate

2*50+3*65=100+195=295lei
3*50+5*65=150+325=475lei