MATH HELP: Why is the answer 24, and not 25?

Anonymous
MATH HELP: Why is the answer 24, and not 25?
There are 20 blue cards. There are five cards numbered 17. So I added 20+5= 25/100 and chose K. But the correct answer is J. Can you explain it?
MATH HELP: Why is the answer 24, and not 25?
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