The area of a triangle is half the product of the base and the height.
Since multiplication is commutative, the following expressions are equivalent:

So, option D is correct
The answer is 66%. You get the answer by multiplying 100 to 0.66.
Y=5x+12
Y being the total amount and x being the number of games
You just have to multiply each number by 180 and that's how many you have of each color respectively