Points on line segment

Points P & Q belong to segment AB. If AB=a, AP = 2PQ = 2QB, find the distance: between point A and the midpoint of the segment QB.

Correct result:

x =  0.8 a

Solution:

a=1 a1=1/(1+2+2)=15=0.2 x=(1+2+2/2)⋅ a1=(1+2+2/2)⋅ 0.2=45=0.8 a

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