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Numbers - General Aptitude

Q1:

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:

A 553681

B 555181

C 555681

D 556581

ANS:C - 555681

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.