1 answer
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Step 1: Add the units column: B + D = D (since B + D = 10 + B + D - 10 = D)
Step 2: Add the tens column: 3 + C = D (since 3 + C = 10 + 3 + C - 10 = D)
Step 3: Add the hundreds column: 3 + A = 7 (since 3 + A = 7)
From step 3, we can determine that A = 4.
Therefore, A represents the digit 4.