Choose the right average for a situation (mode, harmonic mean)

This type of question, asked 2 times: CDS 2 2020, CDS 2 2025. All 2 questions below, oldest first.

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Question 1
CDS 2 2020
93 $Which one of the following measures of central tendency will be used to determine the average size of the shoe sold in the shop ?$
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Question 2
CDS 2 2025
92 $To find the average ratio like price/unit, work done/hour, kilometre/hour under certain conditions, the suitable measure of central tendency applicable is$
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