As shown in the figure, given that line AB = 10cm, point C is on the extension line of AB, and points m and N are the midpoint of AC and BC respectively, then how many centimeters is Mn equal to A————M—B——N——C

It is known that ab = 10, am = MC, CN = Nb, Mn
Let am be x and cn be y
Because am = MC = x CN = NB = y
So 2x + 2Y = AB = 10
2(x+y)=10
x+y=5
x+y=MC+CN
Mn = 5 for recommendation

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