Question

Daca pe un cantar se pun 4 caramizi si 5 tigle,acesta indica 22 kg.Masa totala a 8 caramizi si 3 tigle este egala co 30 kg.Cat cantareste o caramida?Dar o tigla?

Answer 1

4 caramizi ..........5 tigle ..........22kg
8 caramizi          3 tigle ..........30 kg
caramida = ?
tigla = ?

4 caramizi .....2 tigle .....30-22 = 8 kg
se inparte la 2
2caramizi ..................4 kg
1 caramida = 4 :2
1 caramida = 2 kg

4 caramizi .........5 tigle .......... 22kg
4*2 ....................5 tigle ..........22 kg
5 tigle = 22 - 8
5 tigle = 14
tigla = 14 : 5
tigla = 2.8 kg

Answer 2

4c+5t=22 rezulta 4c+5t+8=30
8c+3t=30
4c+5t+8=8c+3t=30
4c+5t+8-3t=8c
4c+2t+8=8c
2t+8=8c-4c
2t+8=4c
Putem sa inlocuim
4c+5t=22
2t+8+5t=22
7t+8=22
7t=14
t=2
c=3 asta poti sa afli cum vrei