If a number of two digits is k times the sum of its digits, then the number formed by interchanging the digits is the sum of the digits multiplied by 


(a) 
k1 
(b) 
11k 
(c) 
9+k 
(d) 
10k 
If a number of two digits is k times the sum of its digits, then the number formed by interchanging the digits is the sum of the digits multiplied by 


(a) 
k1 
(b) 
11k 
(c) 
9+k 
(d) 
10k 
Let the ten’s digit be and the unit’s digit be
Then, number =
Number formed by interchanging the digits =
Let
Then,