Weigh the jar, and divide by the weight of a single jellybean.
Here, we want to find a good way of estimating the number of jellybeans in the jar.
The best answer here is to weigh the jar and divide by the weight of a single jellybean.
This is because each of the jellybean contributes to the weight of the jar. And since the weight of one of the jellybeans almost roughly equal that of the rest, then the addition of all these weights give the total weight of the jar
So by dividing the weight of the jar by the weight of a sinkgle jellybean, we get the number of jellybeans present in the jar.