Question

Stefan,Gabriela si Marian au cules impreuna 640 kg fructe.Stiind ca Marian a cules de 3 ori mai putin de cat Gabriela si cu 10 kg mai mult decat Stefan,sa se afle cate kg a cules fiecare copil.

Answer 1

M  I---I+10
G  I---I---I---I
S  I---I                }640 kg
egalam segmentele
640-10 = 630
aflam cate kg de fructe a cules Stefan
630:5 = 126 Kg
Cate kg de fructe a cules Marian?
126+10 = 136 kg
Cate kg de fructe a cules Gabriela?
126*3 = 378 kg
Verificare
126+378+136 = 504+136 = 640 kg

Answer 2

x=marian=y:3
y=gabriela = 3x
x+y=640 kg
x+3x=640 kg
4x=640 kg /:4
x=135 kg
y= 135 • 3 = 405 kg
stefan = z
z = x+10=135 + 10 = 145 kg