Respuesta :

4. 4 is the lowest without having to fractipnalize.
One way to solve this problem is with prime factorization
12 = 2 × 2                    × 3
28 = 2 × 2                          × 7
32 = 2 × 2 × 2 × 2 × 2

LCM = 2 × 2 × 2 × 2 × 2 × 3 × 7 = 672

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