The expression of 15km as a percentage of 120km as required in the task content is; 12.5%
Since it follows from convention that a percentage is a representation of an entity as a fraction of a hundred partitions.
On this note, the percentage representation is such that;
15km of 120km is;
(15/120) × 100%
0.125 × 100%
= 12.5%.
Ultimately, 15km is 12.5% of 120km.
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