Final answer:
It will take 200 weeks for Zoe and Avery to have the same amount of money.
Step-by-step explanation:
To find the number of weeks it will take for Zoe and Avery to have the same amount of money, we need to set up an equation.
Let's say it takes x weeks for this to happen.
After x weeks, Zoe will have $400 - x dollars left, and Avery will have $600 - 2x dollars left.
Setting up the equation:
$400 - x = $600 - 2x
Simplifying the equation:
x = 200
So, it will take 200 weeks for Zoe and Avery to have the same amount of money.