Drawn many Venn diagrams, but I can't get it. It's driving me craaaazy!

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Can anyone pls help me with the solution to this brain bugging problem.
using venn diagram
In a school of 105 teachers, 51 teach mathematics and physics but none teach both math and chemistry. how many teach only physics?

Relevant page
<a href="/counting-probability/counting-probability-intro.php">Counting and Probability - Introduction</a>
What I've done so far
Drawn many Venn diagrams, but I can't get it. It's driving me craaaazy!

I've had closer look at your question and I believe there is not enough information. We would need to know some of the other intersections before we could solve this.

X

I've had closer look at your question and I believe there is not enough information. We would need to know some of the other intersections before we could solve this.