Question

Stiind ca a:b=3, b:2=c, a-b=40, afla:3a-4b+5c

Answer 1

a:b=3-> a=3b
b:2=c->b=2c->a=2cx3-> a=6c
6c-2c=40
4c=40
c=40:4
c=10
b=10x2=20
a=10x6=60
3x60-4x20+5x10=180-80+50=100+50=150