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Number Sequences and Logic Puzzles
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QuestionClick to flip
A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
AnswerClick to flip back
A
20
💡 Explanation:
The digit 9 appears in the units place 10 times (9, 19, 29... 99) and in the tens place 10 times (90, 91, 92... 99). The number 99 is counted in both, totaling 20 instances of the digit 9.