The green triangle is a dilation of the red triangle with a scale factor of s = } and the center of dilation is at the point (4,2)

The answer is A, 28. If there were ten people to start with, then persons 1-6 would make one group, persons 2-7 would make another, persons 3-8, persons 4-9, persons 5-10, persons 1, 8, 9 10, 4, 5, etc, if you go through all ten numbers and put them all in groups, the number og groups made would be twenty-eight