Concept:The perimeter of a rectangle is the total distance around it, given by 2×(length+width).Explanation:Let the width be w.Given length =7cm and perimeter =24cm.Using the formula:24=2(7+w)Divide both sides by 2:12=7+wSubtract 7 from both sides:w=12−7=5cmAnswer:The width of the rectangle is 5cm, which is option B.