math (distance problem)
posted by anonymous .
The points A, B, C, D, and E are located on a straight line in order. The distance from A to E is 20cm. The distance from A to D is 15cm. The distance from B to E is 10cm. C is halfway between B and D. Find the distance from A to C.: *
2.5 cm
5 cm
10 cm
12.5 cm

Draw a sketch and think it through, one statement at a time.
The first tells you that the total length is 20 cm.
The second tells you that D is 5 cm from the the right end (E).
The third tells you that B is 10 cm from each end (and in the middle). The fourth tells you where to put C
etc
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