Respuesta :

Answer:

0.5kg

Step-by-step explanation:

5kg/2=2.5kg

2.5kg/5=0.5kg

Answer:

12.5 is the mass of the Ball Step-by-step explanation: The book weighs half of 5 so that is 2.5 it says then...  The book is 5 times heavier than a ball. so 2.5*5= 15.5