Molly is wrapping up paarts of sandwiches to sell at her sandwich cart. she cuts each sandwhich in fourths and then wraps each fourth sp=eparatley she says that she wrapped 16 fourths so she wrapped 16 whole sandwiches what was mollys mistake?

Molly actually only wrapped 4 whole sandwiches. 16/4 is a fraction so you need to simplify it to find the answer of how many actual sandwiches she cut up and then wrapped. To find out the whole number you divide the numerator by the denominator. 16 divided by 4 is 4. The quotient is the amount of sandwiches she cut up. Molly made the mistake of counting each fourth as a whole sandwich. 

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