How do i complete the rest of the table

There is insufficient information. You have 7 blanks and only 6 independent equations.

By making the numbers add up, the two middle rows can be filled as
.. 25 .. 13 .. 12 .. 50
.. 40 .. 28 .. 12 .. 80

For the other four emply slots, you can pick one value and compute the rest based on that. If there is additional information, such as Vanilla = Strawberry in young ages or in total, for example, then you can use that to find the remaining values. Otherwise, you're out of luck.

Ithink is a. true, but not sure