Răspuns:
a=700, b=560
Explicație pas cu pas:
a/b=5/4
a+b/2+60=690=) a+b/2=630 =) a+b=1260=) a=1260-b
1260-b/b=5/4 =) 5040-4b=5b=) 5040= 9b=) b= 560
a=1260-560=700
