Respuesta :

Answer:

15

Step-by-step explanation:

adding 15 black beads gives you 16 black beads and 4 white beads

16/4 =4/1 or 4:1
The answer is 15 because adding on 15 black beads will give 16 black beads and 4 white beads

16/4= 4:1

Hope this helps

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