A number consists of two digits. The sum of the digits is 9. If 63 is subtracted from the number, its digits are interchanged. Find the number. 


(a) 
64 
(b) 
49 
(c) 
81 
(d) 
91 
A number consists of two digits. The sum of the digits is 9. If 63 is subtracted from the number, its digits are interchanged. Find the number. 


(a) 
64 
(b) 
49 
(c) 
81 
(d) 
91 
Let the ten’s digit be Then, unit’s digit be 9
Number =
Number obtained by reversing the digits =
So, ten’s digit = 8 and unit’s digit = 1.
Hence, the required number = 81.