Answer:
51
Explanation:
if you have 506 you split it up so you get 500 and 6
but there can't be a container with 6 marbles so you give 10 from the 500 so now you will get 490 and 16 the 490 divide by 10 = 490
after that 16 divide by 8 = 2 so 49 + 2 = 51