Hi cg0588,

Yes, you CAN use the Tic-Tac-Toe Board to answer this question. Here's how:

Attachment:

GCTTTBoard.png [ 452.06 KiB | Viewed 6137 times ]
From the prompt, you have enough information to fill in the right-most column. We're asked to find the value in the lower-left corner.

Fact 1: 50 students are in Geometry, but NOT Biology.

This Fact gives us the upper-middle box, which we can use to figure out the upper-left box. Unfortunately, it's not enough info to answer the question.

Fact 1 is INSUFFICIENT.

Fact 2: The same number of students are enrolled in BOTH classes as are enrolled in NEITHER of the classes.

Let's call the number of students X...so we have X in two of the boxes.

Working on the second row, we have ___ + X = 50, so the ____ must be (50-X)

Now, using the first column, we have (X) + (50-X). The +X and -X cancel out and we're left with 50.

Fact 2 is SUFFICIENT.

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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