Kate is 4 years older than her sister. the sum of
their ages is 16. how old is kate?

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

you should think about the answers you give and expect the same form your questions.