David had $500 in his savings account when Sarah opened a savings account with
$200.
• David deposited $20 into his savings account each week.
•Sarah deposited $50 into her savings account each week.
•The accounts did not earn interest.

Which equation can be used to find x, the number of weeks it will take Sarah to
save the same amount of money as David?
O A. 500 + 50x = 200 + 20%
O B. 500x + 20 - 200x + 50
O C. 520x = 250x
D. 500 + 20x = 200 + 50x