
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
Let the sides opposite to the angles $A$, $B$, $C$ in $\triangle ABC$ be $a$, $b$, $c$ respectively, and $\cos B= \frac {4}{5}$, $b=2$,  
(Ⅰ) when $A=30^{\circ}$, find the value of $a$;  
(Ⅱ) when the area of $\triangle ABC$ is $3$, find the value of $a+c$.

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