Multiple choice

A litre weight of water weighs 1.25 kilograms, and a litre of another liquid weighs 750 grams. A mixture of the two weighs 1.12 kilograms. The ratio of their volumes in a litre of the mixture is:

  1. $37 : 13$
  2. $13 : 37$
  3. $25 : 13$
  4. $13 : 25$
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A Correct answer
Explanation

पानी का घनत्व = 1.25 kg/Litre, दूसरे तरल का = 0.75 kg/Litre। मिश्रण का घनत्व = 1.12 kg/Litre। माना पानी = x litre, दूसरा = y litre। x + y = 1 और 1.25x + 0.75y = 1.12। हल करने पर x = 0.74, y = 0.26। अनुपात x:y = 74:26 = 37:13।

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