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Difficulty: EasyDrawing Logical Conclusions

Standard military field radios automatically switch to low-power emergency mode only when the main battery charge drops below twenty percent. During a four-hour patrol, Sergeant Miller maintained continuous high-power transmission without the radio ever entering emergency mode.

Based on the radio's continuous operation in high-power mode, what logical conclusion can be drawn regarding the battery charge level? Fill in the blank to complete the deduction.

Answer:Because the radio never entered low-power emergency mode, the patrol team concluded that the battery charge remained at or above 【20】 percent throughout the mission.

Answer

20 (or twenty)
The passage states that the radio switches to low-power emergency mode only when the battery drops below twenty percent. Because the radio operated in high-power mode without interruption and never triggered emergency mode, it is logically certain that the battery charge remained at or above 20 percent throughout the mission.

Step-by-Step Solution

1
Identify the operating condition specified in the passage.
The radio automatically switches to low-power emergency mode only when the battery level drops below twenty percent.
This establishes the mandatory threshold required to trigger a change in operational state.
2
Evaluate the observed performance during the patrol.
The radio maintained continuous high-power transmission without ever entering low-power emergency mode.
Comparing the observation against the rule determines whether the triggering threshold was reached.
3
Formulate the logical deduction.
Because the trigger condition for emergency mode never occurred, the battery charge could not have dropped below twenty percent, meaning it stayed at or above 20 percent.
Applying logical contraposition connects the absence of the effect (no emergency mode) to the absence of the cause (battery did not fall below twenty percent).

Key Concept

Drawing a logical conclusion by applying a conditional rule to an observed outcome
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Drawing Logical Conclusions

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