A 3-digit number $ABC$ , on multiplication with $D$ gives $37DD$ where $A, B, C$ and $D$ are different non-zero digits. What is the value of $A + B + C$ ?

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Kepler. Discussing PYQs. Q.no. 16

A 3-digit number ABCABCABC , on multiplication with DDD gives 37DD37DD37DD where A,B,CA, B, CA,B,C and DDD are different non-zero digits. What is the value of A+B+CA + B + CA+B+C ?