Answer:
Triangular prism?
Step-by-step explanation:
I done this riddle before but I dont remember to cleary of what the answer is.
Answer:

Step-by-step explanation:

After removing one black marble:

Answer:
Step-by-step explanation:
this seems like substitution
If so its the first part is 12x6
second part is 35 x 6
third part is 56 x 6