exam Maths Puzzle Numerical Ability

If D is the midpoint of line AC and C is the midpoint of line AB, and AD is 3 cm., what is the length of AB?

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My daughter is having trouble with equations.
PLEASE help us solve this problem step by step so we can figure out the other 30 she has to do.

h-9=2h-1

Thanks,
Angie solve by completing the square

m^2-25/2m=5/2