A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ?	Select.
A) 10 B) 11 C) 12 D) 15 E) 17
Explanation:   4 a 3 |   9 8 4 } ==&gt; a + 8 = b ==&gt; b - a = 8   13 b 7 |   Also, 13 b7 is divisible by 11 (7 + 3) - (b + 1) = (9 - b)   (9 - b) = 0   b = 9   (b = 9 and a = 1) (a + b) = 10.   10nswer: Option 10
<result>A</result>
A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) = ?