Question 4
If the digit in the unit's place of a two-digit number is halved and the digit in ten's place is doubled, the number thus obtained is equal to the number obtained by interchanging the digits. Which of the following is definitely true?
Solution
Let the two-digit number be xy.
(2x)(y/2) = yx
So, 2x = y or y/2=x
This means the digit in the unit's place is twice the digit in ten's place.
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