Answer:
240 = 2 × 2 × 2 × 2 × 3 × 5
320 = 2 × 2 × 2 × 2 × 2 × 2 × 5
400 = 2 × 2 × 2 × 2 × 5 × 5
LCM = 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 × 5
= 4,800
GCF = 2 × 2 × 2 × 2 × 5 = 80
4,800 ÷ 80 = 60
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