A certain number is 4 times the sum of thedigits.If 18 is added to the – InterviewSolution

1.	A certain number is 4 times the sum of thedigits.If 18 is added to the number, the digitget interchanged. Then the number is(A) 42(C) 36(B) 24(D) of these
Answer» suppose number is 10x+yso 10x+y=4x+4y6x=3yso y=2x10x+y+18=10y+x10x+2x+18=20x+xso x=2 and y=4so number is 20+4=24

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