A two digit number is 4 times the sum of its digit.if 18 is added to the number the new number obtained is that by interchanging the digit of original number.find the number?
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let xy be the number.
first condition gives equation
(10x+y)=4 (x+y)
2nd condition Guinness the following equation
(10x+y)+18=(10y+x)
solving them gives x=2;y=4
number is 24
first condition gives equation
(10x+y)=4 (x+y)
2nd condition Guinness the following equation
(10x+y)+18=(10y+x)
solving them gives x=2;y=4
number is 24
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