Ans b please explain the ans

Dear student
Let digit at ten's place be xThen digit at one's place will be 2xSo, the number will beOne's place digit+10Ten's place digit=2x+10x=12x
Regards

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WHICH QUESTION
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 bla bbyhh
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You have to think. There are 4 answers of this question. The answers are- 24, 12, 36, 48
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I have to write the ans in algebric expression
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Ans is 10x + x=11x , but i dont know how please explain
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What are you looking for?