###Human: There are twice as many centipedes as humans on a certain island and half as many sheep as humans. How many sheep and humans in total are on the island if the number of centipedes is 100?, ### Assistant: The number of humans on the island is 100 / 2 = 50.
There are 1/2 * 50 = 25 sheep on the island.
The total number of sheep and humans is 25 + 50 = 75. 
 So the answer is :  75