1) a container full of water weighs 15.5 lbs. when 1⁄4 of the water is poured out, the container now weighs 12 1⁄2 lbs. how much does the container weigh when empty?

2) on the farm, rather than use money, they exchange animals. the exchanges are are
follows:
4 bunnies = 3 chickens
5 chickens = 2 pigs
3 pigs = 2 donkeys
how many bunnies would you have to trade for a donkey?

3) when 144 is divided by n, there is a remainder of 11. when 220 is divided by n, there is also a remainder of 11. what is the value of n?

4) albert einstein is experimenting with two unusual clocks which both have 24-hour
displays. one clock goes at twice the normal speed. the other clock goes backwards, but at the normal speed. both clocks show the correct time at 13: 00.
at what time do the displays on the clocks next agree?

5) the mean, median and mode of five numbers are all the same. if four of the numbers
are 7, 7, 5 and 7, what must the fifth number be?