Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 59)
59.
A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 9 are wrong and the other digits are correct, then the correct answer would be:
Answer: Option
Explanation:
987 = 3 x 7 x 47
So, the required number must be divisible by each one of 3, 7, 47
553681 
(Sum of digits = 28, not divisible by 3)
555181 (Sum of digits = 25, not divisible by 3)
555681 is divisible by 3, 7, 47.
Discussion:
19 comments Page 1 of 2.
Archana said:
1 decade ago
How does 987 = 3 x 7 x 47 comes please explain?
Manish said:
1 decade ago
@Archana, LSM of 987 is 3, 7 and 47.
Swathy said:
1 decade ago
Any shortcut available for this problem?
Prasanna said:
1 decade ago
LSM means?
Rock said:
1 decade ago
LCM of 987 = 3x7x47.
Aparna said:
1 decade ago
5+5+5+6+8+1 = 30 then how can it divisible by 7 and 47?
Can anyone explain me please?
Can anyone explain me please?
(1)
Prasanna kartik said:
10 years ago
Here is the another method. From the answer you could say last two digits are correct so you can assume that the number would be three digits and last two digits are 6 and 3. By iterations you can calculate 100th place digit also the number would be 563.
Vinay said:
9 years ago
We can solve this question by dividing each option by 987.
As we can see only option C is dividing by 987.
i.e) 555681/987 = 563.
So option C is the correct answer.
As we can see only option C is dividing by 987.
i.e) 555681/987 = 563.
So option C is the correct answer.
(1)
Goutam said:
9 years ago
Please explain me "the formula for the divisible of 47 & 7.
Kota Vinay said:
9 years ago
The sum of the digits in answer results in 30.
How is it divisible by 7? Option D also results in same sum 30. Then option D does not answer. Please explain. I'm unable to get it.
How is it divisible by 7? Option D also results in same sum 30. Then option D does not answer. Please explain. I'm unable to get it.
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