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:
553681
555181
555681
556581
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 2 of 2.

Durgesh said:   9 years ago
Can anyone tell short cut for this problem?

Ramesh said:   9 years ago
I have the doubt how 30 is divided by 3, 7, 47?

Archana said:   1 decade ago
How does 987 = 3 x 7 x 47 comes please explain?

Goutam said:   9 years ago
Please explain me "the formula for the divisible of 47 & 7.

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.

Rock said:   1 decade ago
LCM of 987 = 3x7x47.

Prasanna said:   1 decade ago
LSM means?

Swathy said:   1 decade ago
Any shortcut available for this problem?

Manish said:   1 decade ago
@Archana, LSM of 987 is 3, 7 and 47.


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