Question

ex 8 9 10 11 urgent va rog

Answer 1

11)
a+n+r=120
r=(a+n):3
a=n+18
a)
n+18+n+(n+18+n):3=120
4n=120×3-18×2
4n=360-36
4n=324
n=324:4
n=81
a=81+18
a=99
r=(81+99):3
r=180:3
r=60
b)Numar favorabil:60
Numar posibil:240
Probabilitatea este:240 pe 60/supra 60