Given the line segment Mn = 4cm and the point P is the golden section point, find the length of the longer line segment MP?

Let MP = x, NP = y
x+y=4 2x=4*y
x=8/3
y=4/3
I don't know how to use real score. It should be like this. It seems that it's a junior high school problem. It's a long time ago

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