Question

2 cocosi cantaresc tot atat cat 3 gaini . 8 cocosi si 9 gaini cantaresc 42 kg . Cat cantareste un cocos si cat o gaina ? Urgent va Rog

Answer 1

x-kg cocos 
y-kg gaina

2x=3y
8x+9y=42

8x+9y=42
2x-3y=0 *3

8x+9y=42
6x-9y=0
Aduna relatiine 
14x=42
x=42/14
x=3

2x=3y=>y=2x/3=2*3/3=2 kg

x- 3 kg un cocos
y- 2 kg o gaina