Question

Doi cocosi cantaresc tot atat cu 3 gaini.Opt cocosi si 9 gaini cantaresc 42 kg.
Cat cantareste un cocos si cat cantareste o gaina?

Answer 1

2c=3g=>g=2c/3
8c+9g=42
8c+9*2/3c=42
8c+6c=42
14c=42
c=3
g=6/3=2