Question

6 va rog ajutatima va rog ajutatima

Answer 1

a:b = 3, a = 3 × b
b:2 = c , b = 2 × c
a - b = 40
a = 40 + b
Stim ca a = 3 × b, deci 3 × b = 40 + b
3 × b - b = 40
2 × b = 40
b = 40:2 = 20
a = 40 + 20 = 60
c = 60:2 = 30

3a - 4b + 5c = 3 × 60 - 4 × 20 + 5 × 30 = 180 - 80 + 150 = 100 + 150 = 250