Leah brought 4 1/2 pounds of grapes. of the grapes she bought, 1 7/8 pounds were red grapes. the rest were green grapes. how many pounds of green grapes did leah buy?

Total pounds =  4  1/2

Red   =    1  7/8

Rest were green

Green =  4  1/2  -   1  7/8

Green  =  9/2   -  15/8

            =  (9/2)*(4/4) -  15/8

            =  36/8 - 15/8 =  21/8

21/8 = 2  5/8 pounds were Green

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table