Question

VAnia serioja si natasa aU Impreuna 272 de lei serioja are cu 80 de lei mai mult decat vania iar natasa are de 5 ori mai putin decat serioja cat bani are vania?

Answer 1

V+S+N=272 lei    (Vanea+Serioja+Natasa)
S=V+80 ⇒ V=S-80 ⇒V=5N-80
N=S:5 ⇒S=5N
5N-80+5N+n=272
11N=272+80
11N=352
N=352:11
N= 32 lei are Natasa
S=5x32
S=160 lei are Serioja
V=160-80
V=80 lei are Vania
V: 80+160+32=272 lei

Answer 2

v+s+n=272
s=v+80
n=s:5 ⇒  n= (v+80):5
inlocuim:

v+ (v+80) +(v+80):5= 272
v+v+80+(v+80):5= 272
2v+ 80+v/5+ 16= 272
2v+v/5= 272-96
2v+v/5= 176
10v+v=176*5
11v= 880
v=880 : 11
v= 80

s=80+80
s = 160
 
n= 160 : 5
n= 32

verificare:
80+160+32= 272