Section: Mathematics Knowledge
18)
In the figure, x = 4z and y = 5z. What is the value of z?
Explanation
As we know that x + y = 180 because they each make up a part of the straight line and the angle of a straight line is 180 degrees. We can sub in 4z for x and 5z for y and we have:
x + y = 4z + 5z = 9z = 180, therefore: z = 20.
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