the sum of the digits of a two digit number is 13 the number obtained by interchanging its digit exceeds the given number by 9 find the original number
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Step-by-step explanation:
x+y=13...............1
10x+y+9=10y+x
9=9y-9x
y-x=1. ............. 2
. by 1and 2
y=7 and x=6
required number is 67
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hey !!!
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