Respuesta :
Answer:
20
Step-by-step explanation:
4x3=12
12x4=48 after 10
48x4=192 after another 10
To begin each friends have made 4 bags of dough. This gives 12 bags at the outset. After 10 days all 12 bags are made into (4*12) bags or 48 bags. After 20 days the 48 bags are made into (48*4), or the required 192 bags. After 20 days then the friends have the needed 192 bags