
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
In a large supermarket, there are four types of dairy products: liquid milk, yogurt, infant formula, and adult milk powder. There are 40 different brands of liquid milk, 10 brands of yogurt, 30 brands of infant formula, and 20 brands of adult milk powder. Using the stratified sampling method, determine the sum of the number of yogurt and adult milk powder brands in a sample of 20.

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