Resposta :
6 ma --------- 20dias
10 ma ---------- x
20 = 10
x 6
10x = 20 . 6
10x = 120
x = 120/10
x = 12 dias
10 ma ---------- x
20 = 10
x 6
10x = 20 . 6
10x = 120
x = 120/10
x = 12 dias