Question

In triangle ABC, centroid D is on median (of line) AM. Ad = x + 5 and DM = 3x - 5. Find AM

Answer 1

The centroid cuts the median into the proportions 2/3 and 1/3, but the ratio of the lengths is 2:1.
From your information, we have:
2(3x-5)=x+5
5x=15
x=3
so, AM= 2(3x-5)+(x+5)=2(9-5)+8=16
see: http://www.algebra.com/algebra/homework/Triangles/Triangles.faq.question.257344.html

Answer 2

that's not right.. the answers provided are 12, 6, 13, and 4.

Answer 3

ok.
what about:
AM=(5+3)+(3*3-5)=8+4=12
AM=12

honestly,... it's more on a guessing part.
I'll check now & come back

Answer 4

here is your problem solved & 12 is the right answer!
http://answers.yahoo.com/question/index?qid=20100604120231AAfsRIT

Answer 5

Great! thanks!