It should be 18 because:
100 x 2 = 200
200 + 70 = 270
360 - 270 = 90
90/5 = 18
So x = 18
A tarsier, although a primate, is not an anthropoid. Examples of anthropoids are humans, orangutans, and gibbons. The speciation that happened between the small primate and the anthropoids was 65 million years ago. It was during that time that the common ancestors of all primates were still alive.
Natural selection, if only the best make it the gene pool will have stronger sheep and those sheep breeding will cause even stronger sheep