Sagot :
Cevap:
21
Adım adım açıklama:
30 siyah
24 kırmızı
18 mavi
12 yeşil
Hepsini toplayalım
30+24+18+12=84
Her birine 4 kalem verildiyse
84÷4=21
Bu sınıf 21 kişidir
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