Question

daca a:b=3, c:a=2 si c-b=45 calculeaza 2b+a+3c

Answer 1

a:b=3  =>a=3b
c:a=2  =>c=2a=>c=6b
c-b=45 =>c=45+b 
2b+a+3c=?
6b=45+b
5b=45 
b=45:5
b=9 =>a=9x3 a=27 =>c=27x2  c=54
2b+a+3c=
18+27+162=207
Sper ca te-am ajutat!