Volumes (in litres) of milk and the corresponding masses (in kg) are in direct proportion: $4$ L weighs $4…

Volumes (in litres) of milk and the corresponding masses (in kg) are in direct proportion: $4$ L weighs $4.12$ kg. The mass of $7$ L of the same milk is:
  1. $7.0$ kg
  2. $7.21$ kg
  3. $7.5$ kg
  4. $8.24$ kg

Solution

$k = \dfrac{4.12}{4} = 1.03$ kg/L. Mass of $7$ L $= 7 \times 1.03 = 7.21$ kg.

Asked in: IMO

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