Home » Aptitude » Aptitude What percentage of numbers from 1 to 70 have 1 or 9 in the unit’s digit? A. 21 B. 14 C. 20 D. 1 Answer Workspace Report Discuss Answer with explanation Answer: Option C Explanation Clearly, the numbers which have 1 or 9 in the unit’s digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. Number of such number =14 Required percentage = (14/70 x 100)% = 20%. Workspace

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