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=6b
c-b=45⇒ c=45+b 
2b + a + 3c =?
6b = 45+b⇒5b = 45 ⇒b = 45:5⇒
⇒b = 9
dar a = 3b⇒a=9×3
⇒ a = 27
c = 45 + b =45 +9 =54
⇒c = 54
2b + a + 3c=2×9 + 27 + 3×54 = 18 + 27 + 162 = 207