Question
A number 21978 is multiplied by a 1 digit number to get a product where the digits are exactly reversed. Identify the 1 digit number.
Answer: Option B
:
B
21978 when reversed gives 87912. So the units digit of the product must be 2.
In the original number, the unitdigit is 8. To get 2 in the unitdigit in the product, 8 must be multiplied with either 4 or 9.
8×4=32 or 8×9=72
The tens digit in the reversed number 87912 is 1. To get that, we need to multiply by 4.
23139378×4––––––––––87912–––––––––––––
Hence, 21978 is multiplied by '4' to get a product where the digits are exactly reversed.
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:
B
21978 when reversed gives 87912. So the units digit of the product must be 2.
In the original number, the unitdigit is 8. To get 2 in the unitdigit in the product, 8 must be multiplied with either 4 or 9.
8×4=32 or 8×9=72
The tens digit in the reversed number 87912 is 1. To get that, we need to multiply by 4.
23139378×4––––––––––87912–––––––––––––
Hence, 21978 is multiplied by '4' to get a product where the digits are exactly reversed.
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