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The sum of digits of a two two digit number is 12 the number obtained by interchanging the two digit exceeds the given number by 18 find the number

Posted by Anshika D 7 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Bhumika Bajaj 7 years, 4 months ago

Let unit digit be x and tens digit be y Number=10y+x Reversed no=10x+y A.t.q X+y=12 ....1 10x+y=10y+x+18 9x-9y=18 x-y=2 ...2 Eq. 1and 2 x+y=12 x-y=2 (adding) 2x=14 x=7 y=5

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CBSE > Class 10 > Mathematics