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Solution:
Given KHN is x + 25 and NHJ is x + 20
JHK and MHL are vertically opposite angles,
Hence both angles should be equal.
JHK = JHN + NHK
= x + 20 + x + 25
= 2x + 45
MHL = 3x + 20
Since JHK = MHL
Therefore,
3x + 20 = 2x + 45
x = 25
So,
JHN = x + 20 = 25 + 20 = 45
Summary:
The measure of JHN is 45°.