Which of the following ratios do not form a proportion?
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25 cm : 1 m and Rs. 40 : Rs. 160
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40 litres : 200 litres and 15 bottles : 75 bottles
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20 kg : 80 kg and 25 kg : 625 kg
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200 ml : 25 litres and Rs. 4 : Rs. 500
Reveal answer
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C
Correct answer
Explanation
A proportion exists if the two ratios are equal. In option C, 20:80 simplifies to 1:4, while 25:625 simplifies to 1:25; since 1/4 is not equal to 1/25, these do not form a proportion.
AI explanation
Two ratios form a proportion if their simplified forms are equal, so we evaluate the pairs. For the third option, 20 kg to 80 kg simplifies to 1 to 4, while 25 kg to 625 kg simplifies to 1 to 25. Since 1 to 4 is not equal to 1 to 25, these ratios do not form a proportion.