The Venn diagram is not shown.
a) X is part of both the basketball and soccer circles, but not part of the table-tennis circle. So X represents the number of pupils who are taking both basketball and soccer, but not table-tennis.
b) In brief note that Y is a part of all three circles. So Y represents the number of pupils participating in all three sports.
For the record, this is grade level Mathematics. Some applications of Venn diagrams can get complicated, but these are just basic definitions.
-Dan
Whoops! Okay then, this is a bit higher level than I had thought.
And either I'm doing something wrong or the numbers in the problem aren't correct. I get a negative value for X. Here's the setup:
We know that the total number playing baseball is
from the table and
from the Venn diagram. So
We also know that the total number playing soccer is
and playing table-tennis is
From this last equation we get Y:
We may use either of the other two equations to get X:
So
(The other equation gives the same result. It's consistent anyway!)
If I made a mistake somewhere, please let me know.
-Dan