When objects are weighed on a balance, the side with the heavier object goes down.
For example, consider this picture:
Here, the side with the monkey is going down. So, we can say that:
Monkey is heavier than bananas.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.