
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Points R and S are on line segment CD, and both points are on the same side of the midpoint of CD. Point R divides CD in the ratio 1:5, and S divides CD in the ratio 2:3. If RS = 4, then the length of segment CD is
A) 15
B) 17.143
C) 20
D) 23.5
E) 25

Present the answer in LaTex format: \boxed{Your answer}
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