Answer:
12.75
Step-by-step explanation:
12.75 rounded to the nearest tenth is 12.8, and 12.74 won't work because it will round to 12.7.
Therefore, 12.75 is the smallest possible number.
There will be eight marbles on the 9th line
We are going to have to divide...
We have to put 1 as a denominator for 3 because it's a whole.

Cross multiply.



Each person would get

of the original pizza.
Have a nice day! :)