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Problem 7 - Entrance Test

What is the least common multiple (LCM) of 12, 15, and 20?

Correct: B

The multiples of 12 are 12, 24, 36, 48, 60,... The multiples of 15 are 15, 30, 45, 60,... The multiples of 20 are 20, 40, 60,... The least common multiple is 60.