A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by Then, (a + b) =?

A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by Then, (a + b) =?

A 10

B 11

C 12

D 15

Solution

Correct Answer: Option A

4 a 3 9 8 4 13 b 7

so, the second digit a+8 = b

==> b -a = 8