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
Explanation:
987 = 3 x 7 x 47
So, the required number must be divisible by each one of 3, 7, 47
553681 $\rightarrow$ Sum of digits = 28, not divisible by 3
555181 $\rightarrow$ Sum of digits = 25, not divisible by 3
555681 is divisible by 3, 7, 47.