Can someone anwser
15 x 20 = 5 x ? = 6 x ?
you have to fill in the question

Since all three equations are equal, you take 15 x 20, which =300, once again because all of the equations are equal, take 300 and divide it by 5, that will give you your first question mark.{you should have gotten 60.} To find the second one, you are going to apply the same concept, Take 300 and divide it by 6, giving you your second question mark. {you should have gotten 50}...
P.S.: {hope I helped} :)

if the diameter is 6 units, then the radius is half that, or 3.