white book question

<p>8A3
B87
+57C
A386</p>

<p>in the correctly worked addition problem above, A, B, and C represent digits. What is the sum of A, B, and C?</p>

<p>a) 17
b) 18
c) 19
d) 20
e) 21</p>

<p>please explain, im confused</p>

<p>I think:
C=6
A=2
B=9</p>

<p>823+987+576=2386</p>

<p>oo! hahhaa thanks okay now i see it. For some reason i kept thinking one of the digits had to be negative and i was confusing myself. Thanks a lot!</p>