Question

Un creion a costat 60 de bani iar un pix 80 de bani cati lei ii mai trebuie Sofiei pentru a cumpara 7 creioane si 2 pixuri daca are 4 lei si 90 de bani ?
Vreau un raspuns repede va rog

Answer 1

c=1 creion
p=1 pix
1xc=60 bani => 7c= 60 bani x 7=420 bani =4 lei si 20 de bani

1xp=80 bani=>2p=80 bani x 2=160 bani=1 leu si 60 bani

vom aduna in total suma cumparaturilor: 4 lei si 20 bani+

                                                                  1leu si 60 bani

                                                                 -----------------------
                                                                5 lei si 80bani

ea are la ea 4 lei si 90 bani , deci pt a afla cati lei iar mai trebui, trebuie sa scadem  din totalul sumei cumparaturilor banii ce ii are si ne da: 5 lei si 80 bani-
                                                                                   4 lei si 90 bani

                                                                                    ------------------

                                                                                             90 bani