Respuesta :
Since he collects 3x as many white shells as black shells, (you didn't give the answers to choose from) but I believe it would be 3:1.
Answer:
For every 12 white shells, there are 4 black shells.
For every 15 white shells, there are 3 black shells.
For every 21 white shells, there are 7 black shells.
For every 27 white shells, there are 9 black shells.
Step-by-step explanation:
It's literally just 3 multiplied by the amount of black shells.