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Quantitative Aptitude

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Percentage & Averages

Question
22 out of 30
 

What percentage of numbers from 1 to 70 have squares that end in the digit 1?



A 1
B 14
C 20
D 21
E None of these

Ans. C Square that end in the digit 1 be

Square of last digit 1 & 9

So numbers are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69

So total number is 14

Percent =

Percentage & Averages Flashcard List

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