There are 41 chickens and 31 rabbits the reason is because of addition,31 plus 41 is 62 if there's 72 heads then there's 72 animals and it also says that there is 200 feet so there's the answer I think
So the way I would do this is by finding 72 heads with them all being chickens. So basically multiply 72 by 2 to get 144 legs. So this means that 56 more legs are needed. And since the difference between legs of chickens and rabbits is two, then we just divide 56 by two to figure out how many rabbits there are. 56/2 = 28 And then to figure out the number of chickens, just do 72 - 28 = 44. So there are 28 rabbits, and 44 chickens.
Lets just use for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: . Since then new one is equal to 1, and the original is equal to , we see that this manipulation of the fraction causes an increase of 100%.
for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: 
. Since then new one is equal to 1, and the original is equal to 
, we see that this manipulation of the fraction causes an increase of 100%.