a) a,b si c salariile celor 3 muncitori
a/2=b/5=c/3=k
a=2k
b=5k al 2-lea muncitor are salariul cel mai mare
c=3k
b)
(a+1200)/ (c+1500)=5/7
7a+8400=5c+7500
7a+8400-7500=5c
7a+900=5c
c=(7a+900)/5
a/2=c/3 c=3a/2
(7a+900)/5=3a/2
15a=14a+1800
a=1800 lei
c=3*1800/2=2700 lei
b=5*1800/2=4500 lei