*25hm =25000 Dm
*a)30/100*8700=2610 t livrate
b)8700-2610=6096 t marfa ramasa in depozit
*a=3/8 : 6/8+11/7 x 7/22
a=3/8*8/6 + 1/2
a=1/2+1/2
a=1
*x+y=129
x:y=5,r=3 =>x=5y+3
5y+3+y=129
6y=126
y=21
deci x=5*21+3
x=104
* mai intai trasnformam 40 dam in m adica 400 m
l=400m
L=l+20m=420m
a)P=2L+2l
P=2*420+2*400
P=840+800
P=1640m
b) A=L*l
A=420*400
A=164000m^2