Math
posted by James .
This problem pertains to Cuisenaire Rods:
1white
2red
3green
4purple
5yellow
6dark green
7black
8brown
9blue
10orange
Question:
(a) If an allbrown train is equal in length to an allorange train, what can be said about the number of brown rods compared to the number of orange rods?
(b) If a number can be represented by an allred train, and an allblack train, it has at least eight factors. Name these factors.
(c) What is the smallest number of red rods for which an allred train is equal in length to an allblue train?

wow, haven't seen Cuisenaire Rods since the early 60's
Don't tell me they are still using these.