Understanding the Distance to Mile Relationship

The first pair of words, distance : mile, establishes a relationship where 'mile' is a unit used to measure 'distance'. A mile is a standard unit of length or distance measurement, commonly used in systems like the imperial and US customary systems.

Finding the Unit for Liquid Measurement

The question asks us to find a word that relates to 'liquid' in the same way that 'mile' relates to 'distance'. This means we need to identify the unit of measurement for liquids from the given options.

Analysis of Options:

• Option 1: water - 'Water' is a type of liquid itself, not a unit of measurement for liquids.

• Option 2: gram - 'Gram' is a unit of mass. While mass and volume are related for liquids (through density), 'gram' does not directly measure the volume or quantity of a liquid in the way 'mile' measures distance.

• Option 3: scale - A 'scale' is an instrument or device used for measuring, typically weight or mass. It is not a unit of measurement itself, nor is it the primary unit for measuring the quantity of liquids.

• Option 4: litre - A 'litre' (or liter) is a metric unit of volume, commonly used to measure the quantity of liquids. This aligns perfectly with the relationship seen in the first pair (distance : mile).

Conclusion

Just as a mile quantifies distance, a litre quantifies the volume of a liquid. Therefore, 'litre' is the correct answer as it represents the unit of measurement for liquids.

The analogy is solved as: distance is measured in miles, just as liquid is measured in litres.