Which of the following is considered a variable?

Distance between a moving train and a station

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Number of millimetres in a metre

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42 grams

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25,000 metres

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Solution

The correct option is A Distance between a moving train and a station
The distance between a moving train and a station is a value that keeps changing and is different at different times. So, this is a variable.

The number of millimeters in a meter is always 1000. 42 grams and 25,000 metres are constant values. So, these are not variables.

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