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four times a number, decrease by sixthe 差 of a number and 4/3 is 11/3 . What is the numberamy is twice as old as lucy. three years from now the sum of their ages will be 42. How old is amythe perimeter of a square is 6.4 meters what is its 面積The diameter of a circle is 11 m. Find its 円周 in terms of pipi.