What percentage of numbers from 1 to 70 have 1 or 9 in the unit’s digit? A. 1 B. 14 C. 20 D. 21 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 x 100 % = 20%. 70 Workspace
Required percentage =
% = 20%.
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