
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
The Johnson family consists of a mother, a father, and some children. The average age of the members of the family is $21$, the father is $50$ years old, and the twice the age of the mother plus the total age of the children (represented as $2m + \text{sum of children's ages}$) is $60$. How many children are there in the Johnson family?
A) 1
B) 2
C) 3
D) 4
E) 5

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