Answer:
60
Step-by-step explanation:
The part where y resides is an equilateral triangle. That means that all the angles are equal (along with all the sides). Remember that y is in a triangle.
So the three angles of the triangle = 180/3 = 60
That means that y = 60
Black - 10/35 (2/7)
White - 20/35 (4/7)
Grey - 5/35 (1/7)
i really dont know how to help for #2, but for #4 you would set them equal to each other
4. 3x-10=2x+30
x-10=30
x=40
