Savings Comparison of Two Friends

Two friends, Lisa and Mark, are saving money to buy a new bicycle. Lisa has already saved $40 and plans to save an additional $5 each week. Mark has saved $25 and will save $10 each week. If $x$ represents the number of weeks they save,

determine when Lisa and Mark will have saved the same amount of money. Set up the equations based on their savings and solve for $x$.