A) 11
B) 7
C) 6
D) 9
Correct Answer: D
Solution :
Two digit number = 10x+ y, then \[10x+y=5(x+y)\] or \[4y-5x=0\] ?(i) and \[(10x+y)+9=10y+x\] or \[y-x=1\] ?(ii) Solving Eqs. (i) and (ii), x = 4 and y = 5 \[\therefore \] Required sum of two digits = 4 + 4=9You need to login to perform this action.
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