Kim had 120 cards in a box. she gave 6/10 of the cards to maddy. how many card did kim have left in the box.

How do i get the answer for 2/3 * 10/3

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?