If you were filling the cylinder up with water using a cone that has the same height and diameter, how many cones will it take to fill up the cylinder?

It required 3 cones to fill up the cylinder with the same height and diameter.

Step-by-step explanation:

Let the radius of the cone and cylinder be r.

Let the height of the cone and cylinder be h.

As we know that   ....(1)

It can be observed that the volume of a cone is rd the volume of the cylinder. so, multiply the volume of the cone by 3.

(From equation 1 )

Hence, It required 3 cones to fill up the cylinder with the same height and diameter.