a rectangular tank 28cm long and 18cm wide was filled with water to a dept of 7cm. When 12 marbles were added the level rose to 12cm. Find the average volume of the 12 marbles.

Answer 1

Change in volume
= (28)(18)(5) cm^3
= 2520 cm^3
This was caused by the 12 marbles
that volume was 12(4/3)πr^3
= 16πr^3

16πr^3 = 2520
r^3 = 2520/(16π)
r = (2520/(16π))^(1/3)
I got appr 1.69 cm

check my arithmetic

Answer 2

so you are saying the average volume for 1 marble is appr. 1.69cm?

Answer 3

no, I found the average radius r

I was hoping you would be able to find its volume.
V = (4/3)π r^3 , (I used it)

Answer 4

OHHHH I'm so sorry, havent done this in years, now i understand thank you so very very much!!!