Question

Se știe că: a:b=3;b:2=c;a-b=40; Află:3a-4b+5c.

Answer 1

a:b=3=>a=3b
b:2=c=>b=2c
a-b=40=>b+40=a


a[------]....+40....]
Tot a :[--------]-------]------]
b[----]----]
c[----]

b+40=3b
3b-b=40
2b=40
b=40:2
b=20
________
a=3b
a=20×3
a=60
_______
c=b:2
c=20:2
c=10
_________
3a-4b+5c=
3×60-4×20+5×10
180-80+50=
100+50=150
Succes!!!

Answer 2

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