Question

guess the number of jelly beans in the jar. the jar is 20 cm tall and 8 cm side on the bottom..a jelly been is approximately 1cm×1cm

Answer 1

We can find the total area of the jar assuming that it has a rectangular shape:

$A=20\cdot8=160\operatorname{cm}^2$

since each jellybean measures approximately 1cm x 1cm, this means that the area of each jellybean is 1cm^2,then, we have that there can fit 160/1 = 160 jellybeans