Question

stiind ca s-r=82 si r:s=cinci septimi,determina termenii necunoscuti

Answer 1

s-r = 82
r:s = 5/7 ⇒ r = 5/7*s
s - 5/7*s = 82
s-5*s/7 = 82
7s-5s = 574
2s = 574
s = 574:2
s = 287

s-r = 82
287 - r = 82
287-82 = r
205 = r