The answer to this question is 160 counters. To solve this, figure out what fraction of the counters 100 is. First, add 1/8 and 1/4 to get 3/8. This means that blue counters are 5/8 of the box, and there are 100. Divide 100 by 5 to get 1/8=20, then multiply 20 by 8 to get 160. I hope this helped!
