a)
20%·200=40 premiul |
b) 200-40=160
25% ·160=1/4 ·160=40 premii ||
c) 200-40-40=120
40%·120=2·120:5=48 premii |||
d) 200-(40+40+48)=72 mentiuni
e) b-baieti
f-fete
b+f=200
b=3/2·f
3f/2+f=200
5f/2=200
f=400:5=80 fete
b=200-80=120 baieti
