6) What is the volume of water in cubic ft in the tank if a measure stick indicates the water surface is 6 feet below the top of the tank?

A. 170.2 ft3

B. 254.4 ft3

C. 1017.9 ft3

D. 678.6 ft3.

7) What is the weight in pounds of the tank, as in the above case, if the tank itself weighs 20 lbs per ft of height?

A. 63,424 lbs

B. 42,241 lbs

C. 16,151 lbs

D. 10,605 lbs.

8) How much water in gallons would have to be removed to reduce the total weight of the tank plus water, as in the above case, by 20%?

A. 388 gals

B. 3,230 gals

C. 2,121 gals

D. 626 gals.

9) What would be the new level of the water, as measured from the top of the tank, if the water in the above case (equivalent of 20% of total weight) is removed?

A. 10.4 ft

B. 12.7 ft

C. 7.1 ft

D. 7.8 ft.

10) If everybody at a party shook and with each other, and there was a total of 66 handshakes. How many people attended the party?