<p>oh cool! alright what i did is this: </p>
<p>In essence this is a weighted average question. if you were to divide the total value of the 90 tokens (1275) by 90 you would get the approximate value of each token.</p>
<p>1275/90 = 14.17 This shows that majority of the tokens have a value of 15 since the average is leaning more to 15 (the scale, so to speak, is leaning more to 15, so there are a lot more 15pt tokens than 10pt). So i immediately looked for the highest possible number of 15pt tokens available i.e 75 </p>
<p>if 75 tokens have value of 15 then the remainder, 15, have a value of 10. so the total value of the tokens would equal (75<em>15)+(15</em>10) = 1275</p>
<p>so 75 is the answer! hope this was clear. This took me less than a minute to solve</p>