Aptitude - Percentage - Discussion
Discussion Forum : Percentage - General Questions (Q.No. 4)
4.
What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
Answer: Option
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 |
Video Explanation: https://youtu.be/cBamI6iRNIA
Discussion:
102 comments Page 6 of 11.
Jim said:
6 years ago
The question is not talking about ending with 1 or 9, but it's talking about numbers having 1 or 9.
Manjunath Halageri said:
3 years ago
I think the total numbers are 15 because here, the number 10 is missed.
10 also have the number 1.
10 also have the number 1.
(5)
Manisha said:
8 years ago
What percentage of numbers from 1 to 90 has a 1 or 9 as one of the digits?
Can anyone solve this?
Can anyone solve this?
Ganesh said:
7 years ago
Simple 1 or 9 in unit digit in 1st 10 no. Is 2,
So 1 to 70 = 2*7 = 14.
% = 14/70*100 = 20% Answer.
So 1 to 70 = 2*7 = 14.
% = 14/70*100 = 20% Answer.
(1)
Priya P. said:
1 decade ago
@chandrakala
Its not end in 1 digit, its end with digit 1
as (1)^2=1
(9)^2=81 ;8(1)
got it..
Its not end in 1 digit, its end with digit 1
as (1)^2=1
(9)^2=81 ;8(1)
got it..
Chandrakala said:
1 decade ago
What about 4? 4 is also squre, so 4, 24, 34, 44, 54, 64 also have squre that end in the digit 1.
Raju said:
1 decade ago
25% of a number is less than 18% of 650 by 19. Then the number is?
Please send me the solution.
Please send me the solution.
Achyuth said:
7 years ago
Let's take 100% for all 10numbers placed in the unit digit. Now 2 numbers(1 or 9) it is 20%.
Annu said:
7 years ago
The total number is 70.
Possible values in number.14.
14 is what % of 70.
(14*100)/70.
=20.
Possible values in number.14.
14 is what % of 70.
(14*100)/70.
=20.
Gain.... said:
9 years ago
But they asking 1 or 9 (if they asking instead of this 1 and 9). What will be the answer?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers