a= primul nr. /--------/
b= al 2 leanr. /--/-2
c=al treilea nr /----/
Suma=418. Aflam suma daca b ar avea un sfert din a. 418+2=420
aflam cate segmente egale sunt. a are 4 segmente,b are 1 ,iar c are 2 deci 7 segmente. Aflam cat reprezinta un segment. 420:7=60
Aflam numerele: b=60-2=58; a=60×4=240; c=60×2=120
Proba: 58+240+120=428