Introduction / Context:
An odometer is a device that measures distance traveled. We must choose the option where the first item is an instrument and the second is what it measures, preserving the device-to-quantity relationship.
Given Data / Assumptions:
- Odometer → measures distance.
- Correct answer must be instrument → measured quantity.
Concept / Approach:
- Identify which options present a tool or measuring instrument paired with its measurement.
- Reject pairs that present units, dimensions, or unrelated concepts.
Step-by-Step Solution:
1) Confirm relationship: odometer : distance.2) 'scale : weight' — a scale measures weight (or mass by calibration); matches pattern.3) 'length : width' — two dimensions; not instrument-to-measurement.4) 'inch : foot' — units, not instruments.5) 'mileage : speed' — two quantities; not device-to-quantity.6) 'area : size' — general quantities; lacks device.
Verification / Alternative check:
Instrument test: Both odometer and scale are tools whose primary function is to measure specific quantities.
Why Other Options Are Wrong:
length : width — attributes, not measurement by device.inch : foot — measurement units.mileage : speed — different metrics, no instrument.area : size — broad terms; missing instrument.
Common Pitfalls:
Confusing units with instruments. The analogy requires a tool mapped to its measured property.
Final Answer:
scale : weight
Discussion & Comments