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The sum of digits of a …

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The sum of digits of a two digit number us 7. The number obtained, on reversing the order digits is greater than original number by 9. Find the number

Posted by Ankit Kumar 6 years, 2 months ago

CBSE > Class 08 > Mathematics

2 answers

Soni Bitra 6 years, 2 months ago

Sorry take the tens digit as 7-x not 9-x Even thought the answer is same it is 54.

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Soni Bitra 6 years, 2 months ago

Let the unit digit be x Tens digit be 9-x Original number=10*tens digit +unit digit =10*(9-x)+x =90-9x After reversing the digits Unit digit be 9-x Tens digit be x New number =10x+9-x =9x+9 Now 90-9x=9x+9+9 ( bcz after reversing the number is greater by 9 ) =9x+18=90-9x =18x=72 X=4 Therefore unit digit is 4 Tens digit is 9-4=5 Therefore the number is 54.

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CBSE > Class 08 > Mathematics