Bunuel wrote:
Twenty percent of the skiers that tried out for the ski patrol were selected. Of those that were not selected, 15 skiers were CPR certified and 17 were not. How many skiers tried out for the ski patrol?
A. 40
B. 50
C. 60
D. 70
E. 80
We can let the number of skiers who tried out = n; thus:
0.2n = selected, thus 0.8n = not selected
Notice that the number of skiers that were not selected is 15 + 17 = 32. So, we have:
0.8n = 32
n = 40
Answer: A
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