Question

2/5 de 15 bolinhas?
1/3 de 12 Passos?
1/10 de 30 alunos?
1 2\3 de 3 pizzas

Answer 1

2/5 de 15 = (2*15)/5 = 2*3 = 6
1/3 de 12 = (1*12)/3 = 1*4 = 4
1/10 de 30 = (1*30)/10 = 1*3 = 3
1 e 2/3 de 3 = 
(3/3 + 2/3) de 3 = 
5/3 de 3 = (5*3)/3 = 5*1 = 5