Răspuns:
Explicație pas cu pas:
450..................................360°
100elevi............................x=100·360/450=80° cls aVa
450..................................360°
75elevi .............................=y=360·75/450=60° cls a VIa
450..................................360°
125 elevi...........................z=125·360/450=100° cls a VII a
450...................................360°
150 elevi...........................t=150·360/450=120°°° cls aVIII a
Procente 100/450·100≅22,22 %
75/450·100≅16,66 %
125/450·100≅27,77%
150/450·100≅33,33%