Determine 40 kg: 200 kg and 15 kg: 75 kg are in proportion and write their middle term.
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Answer:
40 : 200 = 4 : 20 = 1 : 5
15 : 75 = 3 : 15 = 1 : 5
40 : 200 :: 15 : 75
1 : 5 :: 1 : 5
5 and 1 are the middle term
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