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Critical Reasoning (CR)What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

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21%(00:08)   |   79%(00:22)   |   14

What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

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Spoiler for correct answers:

Correct Answer is:- C. 20


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Jimit
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

Post by Jimit » Sat Mar 10, 2018 4:39 pm

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


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