Question

se știe ca a:b=3 b:2=c a-b=40 afla 3a-4b+5c

Answer 1

a=3b
b=2c
a=40+b=>3b=b+40=>b=20
c=10
a=60
180-80+50=150

Answer 2

deci ai

a:b=3=> a=3b

            a-b=40

din  ultimele doua=> 3b-b=40=>2b=40=>b=40:2=>b=20

daca b=20 si a=3b=>a=20 ori 3=>a=60

b:2=c=> 20:2=c=>c=10

deci 3a-4b+5c= 3 ori 60-4 ori 20+5 ori 10= 180-80+50=100+50=150