For the following problem, do not use algebra. make a guess that satisfies one or more conditions of the
problem, and then evaluate your guess.

you must show work to support your solution, for example, use a table
to document your guesses.

there are 54 animals in a pen; all the animals are either ducks or piglets. if there are 122 feet on these animals
(and none of them are missing legs), how many ducks are there in the pen? how many piglets?

a) use your own words to describe the big-picture ideas in the following scenario:

b) use your own words to list out each important detail in the scenario:

c) solve by guess and check:

47 Ducks and  7 piglets.

Step-by-step explanation:

Lets try 27 of each to start

Ducks Piglets  Total legs

27        27          54 + 108 = 162.  Too many

30        24          60 + 96  =  156   Too many. Increase the ducks by 10:

40        14           80 + 56  =   136.  

50          4          100 + 16  = 116 This < 122 so ducks between 40 and 50..

45           9          90 + 36 = 126  Too high so increase  ducks:

46           8          92 + 32 = 124  Close.

47           7           94 + 28 = 122.

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m