Answer:
We have the relation:
1ft = 12 inches.
Then, if we cube both sides, we have:
(1ft)^3 = (12 in)^3
1ft^3 = 288 in^3.
Now we know that:
The bucket is 864 in^3
The tank is 7 ft^3.
knowing that 1 ft^3 = 288in^3
Then 7 ft^3 is seven times that:
7ft^3 = 7*(1ft^3) = 7*(288in^3) = 2016 in^3
Now the number of buckets needed to completely fill the tank is:
N = (2016 in^3)/(864in^3) = 2.33
So you need 2.33 buckets, or we can round it up to 3 buckets, where the third bucket will have some water inside it when the tank is completely filled.
