Austin works a total of 2 hours on Mondays + 1 hour on Wednesdays + 3 hours on Fridays = 6 hours per week.
Since he earns $5 for every hour he works, his total earnings per week are 6 hours x $5/hour = $30 per week.
To buy a bicycle worth $180, Austin needs to work for $180 / $30 per week = 6 weeks.
#### 6
The answer is: 6
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Austin earns $5 for every hour he helps his father build a deck in their backyard and wants to buy a bicycle worth $180, how many weeks does he need to work if he works for 2 hours on Mondays, 1 hour on Wednesdays, and 3 hours on Fridays?

### Answer:
