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8

<p>Although the above trick method yields the answer quickly, I always get confused unless I can solve a question using plain old algebra. So here’s what I do:</p>

<p>Say there are T 10-point tokens and F 15-point tokens.</p>

<p>T+F=90 (As given)
10<em>T+15</em>F=1275 (Given, too)
Now T= 90-F
Put this in the second equation, which then becomes:
10<em>(90-F)+15</em>F=1275, and you get the answer.</p>