Question

Dan a cumparat 3 caiete si 4 pixuri, iar Mara 4 caiete si 3 pixuri.Dan a dat la casa o bagnota de 100 de lei si a primit rest 63 de lei,iar Mara a dat la casa o bagnota de 50 de lei si a primit rest 17 lei.Cat costa un caiet?Dar un pix?

Answer 1

3caiete..................4pixuri...............100lei-63lei
4caiete..................3pixuri................50lei-17lei
-------------------------------------------------------------
3caiete...................4pixuri....................37lei |x4
4caiete....................3pixuri....................33lei |x3
-------------------------------------------------------------------
12caiete.................16 pixuri................,.....148lei
12caiete...................9pixuri........................99lei
  /..............................7pixuri.......................49 lei
                                   1pix..........................49:7
                                    1pix     .....................7lei
                                     9pixuri......................7leix9
                                       9pixuri......................63lei
                                       12caiete...................99lei -63 lei
                                        12caiete...................36 lei
                                          1caiet....................36:12
                                             1caiet....................3 lei

R:3lei un caiet si un pix 7 lei