Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 74)
74.
Which one of the following numbers is completely divisible by 45?
Answer: Option
Explanation:
45 = 5 x 9, where 5 and 9 are co-primes.
Unit digit must be 0 or 5 and sum of digits must be divisible by 9.
Among given numbers, such number is 202860.
Discussion:
10 comments Page 1 of 1.
Kiran said:
4 years ago
What about option A.
Its sum is 21 divisible by 3.
And also it is divisible by 5 can anyone explain me clearly?
Its sum is 21 divisible by 3.
And also it is divisible by 5 can anyone explain me clearly?
(2)
Naveen said:
5 years ago
What is meant by co-primes?
Vikash said:
6 years ago
18 is not divisible by 5.
Abhishek verma said:
7 years ago
LCM of 45 =9 * 5 .
Add of all digits.
2+0+2+8+6+0=18.
So the number of 18 is divided by 9.
Add of all digits.
2+0+2+8+6+0=18.
So the number of 18 is divided by 9.
Md Taibur Rahman said:
7 years ago
@ Pooja.
If you take 3 and 5 it will be (3*5)=15.
But it must be 45. So, 3*5 will not be taken through these two are co-prime too.
If you take 3 and 5 it will be (3*5)=15.
But it must be 45. So, 3*5 will not be taken through these two are co-prime too.
Pooja said:
8 years ago
For 45 instead of 5 and 9 why can't we take 5 and 3 as these 2 are also coprime?
Ramesh said:
9 years ago
45 = 3*3*5,
So, 181560 = 21,
331145 = 17,
202860 = 18,
2033555 = 23,
So, only 18 can divisible 3 two times hence 202860 is answer.
So, 181560 = 21,
331145 = 17,
202860 = 18,
2033555 = 23,
So, only 18 can divisible 3 two times hence 202860 is answer.
Ranji said:
9 years ago
Give shortcut method please.
Lakshmipriya said:
10 years ago
I can't understand could please explain clearly.
Sallu said:
1 decade ago
202860
2+0+2+8+6+0=18
18 is divisible by 9
And it is divisible by 5
So that it can divisible by 45(9*5).
2+0+2+8+6+0=18
18 is divisible by 9
And it is divisible by 5
So that it can divisible by 45(9*5).
(1)
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