Answer: Mrs. Williams purchased 5 fruit baskets.
Explanation:
Here , b= number of fruit baskets
Given equation: 15b + 30 = 105
Subtract 30 from both sides
15b = 105-30
⇒ 15b = 75
Divide both sides by 15 , we get
b= 5
Hence, Mrs. Williams purchased 5 fruit baskets.