A boy multiplied 423 by a number and obtained 65589 as his answer. If both the fives in the answer are wrong and all other figures are correct, the correct answ

A boy multiplied 423 by a number and obtained 65589 as his answer. If both the fives in the answer are wrong and all other figures are correct, the correct answer is-

A boy multiplied 423 by a number and obtained 65589 as his answer. If both the fives in the answer are wrong and all other figures are correct, the correct answer is- ?

Created: 1 year ago | Updated: 1 week ago | Created By:

Ashraful Islam

60489

62189

61189

62389

0 29

Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Officer - 28.03.2014
Topic: Mathematics (সাধারণ গণিত) Subject: Mathematics (সাধারণ গণিত)

Best Answer Explained in Below-:

You're right, option (a) 60489 is the correct answer.

Here's why:

Mistake in the answer: We know there's a mistake because both fives (in the units and tens place) are incorrect.
Other digits are correct: The problem states that all other digits (6, 5, and 8) are positioned correctly.
Finding the difference: The mistake with the fives essentially means the boy added an extra 55 (5 in the units place + 50 in the tens place) to the actual product.
Correcting the answer: To arrive at the correct answer, we need to subtract this extra 55 from the incorrect answer (65589).

Therefore, Correct Answer = Incorrect Answer - (Extra value due to the mistake) = 65589 - 55 = 60489

So, the boy actually multiplied 423 by a number resulting in 60489, but mistakenly wrote down both the fives in the answer.

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A boy multiplied 423 by a number and obtained 65589 as his answer. If both the fives in the answer are wrong and all other figures are correct, the correct answer is- ?

The least number of 5 digits which is exactly divisible by 12, 15, and 18 is -

The least perfect square,which is divisible by each 21, 36 and 66 is -

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