A number is made up of two digits. If the digits are swapped and the new number is added to the old, the result is divisible by:
A. 3
B. 5
C. 9
D. 11
Answer:D
A number is made up of two digits. If the digits are swapped and the new number is added to the old, the result is divisible by:
A. 3 B. 5 C. 9 D. 11
Explanation: Let x be the tenth digit and y be the unit digit.Then number is equal to 10x + y.10y + x is the number produced by swapping the digits.(10x + y) + (10y + x) = 11(x + y).