Michael and Lindsey are saving money. Michael begins with $20 and saves $5 per week. Lindsey begins with no money, but saves $10 per week. Enter the number of weeks it will take for Lindsey and Michael to save the same amount of money.

Solution:
To solve this it will help to make a table for each person's savings
Lindsey:             Michael:
1         10            1           25      
2        20           2          30
3        30           3           35
4         40          4           40
5         50          5           45
As you can see Michael and Lindsey will have the same amount of money in week 4.