Iron pole

The iron pole is in the ground 2/5 of its length, partly above the ground 1/3 is yellow, and the unpainted section is 6 m long. How long is the entire column?

Correct result:

x =  15 m

Solution:


2/5 • x + 1/3•(x-2/5•x) + 6 = x

6x = 90

x = 15

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