Answer:
The given equation is:
15x + 30 = 105
Here,
15x represents the total cost of the fruit baskets purchased, and
30 represents the cost of the membership fee.
To find the number of fruit baskets purchased (x), we must isolate the variable on one side of the equation.
Subtracting 30 from both sides, we get:
15x = 105 - 30
15x = 75
Dividing both sides by 15, we get:
x = 5
Therefore, Mrs. Williams purchased 5 fruit baskets for her coworkers.