I can buy 3 cans of soda for $1.05. How many cans can buy at the same rate for $21?

Which of these choices show a pair of equivalent expressions?

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

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement