Respuesta :

perimeter is 54 cm. length is 15 cm so 2 x 15 =30 . so we are left with 54-30 =24 cm.so 2 x width =24 cm . so the width  is 12 cm 
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54 inches - 15 inches - 15 inches = 24 inches (length of 2 widths)
24 inches ÷ 2 = 12 inches

Ans: 12 inches