Question

Doi cocosi cantaresc tot atat cat 3 gaini .Opt cocosi si 9 gaini cantaresc 42 kg cat cantareste un cocos si cat cantareste o gaina ,stiind ca totii cocosi, au aceasi greutate respectiv torte gainile cantaresc la fel.

Answer 1

2 cocosi = 3 gaini

8 cocosi=(8:2)x3=4x3=12 gaini

8 cocosi+9 gaini=42 kg

12 G +9 G=42 kg

21 G=42 kg

1 G=42:21=2 kg

1 gaina=2 kg

8 c +9x2=42 kg

8 c+18=42 kg

8 c=42-18=24

1 c=24:8=3 kg

1 cocos=3 kg