Question

8 vaci....20 oi....240 kg fân. 3 vaci....8 oi....94 kg fân. Câte kg fân consumă 6 vaci si 10 oi?

Answer 1

8 vaci....20 oi.....240 kg
3 vaci....8 oi.....94 kg,prin metoda comparatiei avem:
8v.....20 o....240| inmultim cu 3
3 v....8 o....94|inmultim cu 8 si avem
24 v....60 o.....720
24 v....64o....752 facand diferenta vom observa ca avem 64-60=4oi si 752-750=32 kg,deci 4 oi consuma 32 kg de fan ,32:4=8 kg consuma o oaie,deci 8 oi vor consuma 64 kg fan,3 vaci vor consuma 94-64=30=>o vaca va consuma 30:3=10 kg
inlocuim 6 v=6*10=60
10 o=10*8=80
80+60=140 kg

Answer 2

8 vaci............. 20 oi ...............240 kg fan/x2
3 vaci ..............8 oi ................ 94 kg fan /x5
se inmulteste fiecarerelatie si se obtine
16 vaci ............40 oi ............... 480 kg fan
15 vaci ............ 40 oi .............. 470kg fan
____________________________________ se scad si se obtine
1 vaca ......... / ........................ .. 10 kg fan
1 vaca=10 kg fan
6 vaci=6x10=60 kg fan
3vacix10 kg .............. 8 oi ................ 94 kg fan
30 kg ......................    8 oi ................. 94 kg
8 oi=94-30=64 kg
1 oaie=64:8
1 oaie=8 kg fan
10 oi=10x8=80 kg fan
6 vaci+10 oi=6x10+10x8=60+80=140 kg fan