Number of golfers that didn't qualify = 30
Step-by-step explanation:
Total number of golfers = 80
The percentage that qualified for the next round = 62.5% = 0.625
Number that qualified = 80 * 62.5%
= 80 * 0.625
Number of golfers that qualified = 50
Number of golfers that didn't qualify = Total number of golfers - Number of golfers that qualified
= 80 - 50
Number of golfers that didn't qualify = 30