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AMC 12 2020a Problem 21

  • Paper

How many positive integers nn are there such that nn is a multiple of 55, and the least common multiple of 5!5! and nn equals 55 times the greatest common divisor of 10!10! and n?n?

(A) 12(B) 24(C) 36(D) 48(E) 72\textbf{(A) } 12 \textbf{(B) } 24 \textbf{(C) } 36 \textbf{(D) } 48 \textbf{(E) } 72

Dataset text AMC 12 2000 to 2025. Quoted with source.

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D

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