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Composed unit: You are going on a pack trip with several people. Their gear weight 300 pounds. If one llama can carry 75 pounds, how many llamas will you need?
Multiplicative comparison: One pannier has a volume of 3 square feet while another has a volume of 4 square feet. the smaller is 3/4 the volume of the larger or the larger is 4/3 (1 1/3) the volume of the smaller.