Final answer:
The width of a rectangle, given a perimeter of 50 cm and a length of 15 cm, is calculated by using the formula for the perimeter of a rectangle and solving for width. The width of the rectangle is 10 cm.
Step-by-step explanation:
The perimeter of a rectangle is calculated by the formula: Perimeter = 2(Length + Width). If we know the perimeter is 50 cm, and the length is 15 cm, we can substitute those values into the formula to solve for the width. We would have: 50 = 2(15 + Width). Solve the equation, 50 = 30 + 2(Width), then subtract 30 from both sides to get 20 = 2(Width). Finally, divide both sides by 2 to solve for Width, which gives us Width = 10 cm. So, the correct answer is a) 10 cm.
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