Answer:
647
Step-by-step explanation:
The divisibility rule for 9 can be used to find the unknown number.
Divisibility rule
A number is divisible by 9 if the sum of its digits is divisible by 9.
The number 3D8 will be divisible by 9 when 3 + D + 8 = <multiple of 9>. Since D is a single digit, we must have ...
11 +D = 18
D = 7 . . . . . . . subtract 11
The number 3D8 is 378.
Difference
Now we know that the difference is ...
ABC -3D8 = ABC -378 = 269
ABC = 269 +378 = 647
ABC represents the number 647.
