After the elves had hung 25% of the ornaments on the North Pole tree, there were 480 more ornaments to hang. How many ornaments were in the box to
begin with?

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

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The area of a circle is equal to 1 dm². find the radius of the circle.