Sarah is saving money for a new bicycle. she currently has $50 saved and plans to save $8 per week from her allowance. after how many weeks will she have saved enough money to buy a bicycle that costs $210?

__ weeks

We can solve this problem by setting up an equation.

Let x be the number of weeks it takes for Sarah to save enough money to buy the bicycle.
Since Sarah saves $8 per week, the total amount she will save in x weeks is 8x.
The amount Sarah has currently saved is $50.
The cost of the bicycle is $210.

We can set up the equation:
50 + 8x = 210

Now we can solve for x:
8x = 210 - 50
8x = 160
x = 160/8
x = 20

Therefore, it will take Sarah 20 weeks to save enough money to buy the bicycle.