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2015-06-11T21:51:57+05:30

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Let the digits be x,y 

so 10x+ y = 4(x+ y)

⇒ 2x = y

so all the numbers whose units digit is 2 times the tens digit holds the condition 
the number is 4 times the sum of digits for eg 12,24,36,48 (only possible pairs) ANSWER
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