Let the shaded area = S.<br><br>Given: S : ABCD = 1 : 4, so ABCD = 4S.<br>Given: S : EFGH = 2 : 5, so EFGH = (5/2)S = 2.5S.<br>ABCD : EFGH = 4S : 2.5S = 4 : 2.5 = 8 : 5.<br><br>Final Answer: 8 : 5