Question

Va rog ambele probleme
O sa va multumesc

Answer 1

Problema 8.
a+b+c=340
b=10+3a
c=10+2b⇒c=10+20+6a=30+6a
a+10+3a+30+6a=340
10a=340-40
10a=300/:10
⇒a=30
⇒b=10+3*30=10+90=100
⇒c=30+6*30=30+180=210

Problema 7. 
a-b=144
a:b=7 rest 18 ⇒a=7b+18
a+b=?
7b+18-b=144/-18
6b=126/:6
b=21
⇒a=7*21+18=147+18=165
⇒a+b=21+165=186