Question:
Replace A, B, C by suitable numerals.
Solution:
$A=7, A+6=7+6=13 \quad$ (1 is carried over)
$(1+B+9)=17$, or $B=7 \quad$ ( 1 is carried over)
$A=7, B=7$ and $C=4 \quad(1$ is carried over $)$
$\therefore A=7, B=7$ and $C=4$
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