Amy and Ben took three days to bake 300 cookies for their class party. They baked 160 cookies on the first day and 3/5 of the remaining cookies on the second day. How many cookies did they bake on the third day?
day 1 : baked 160, leaving 300-160 or 140 to be baked
day 2: baked 3/5 of the 140 or 84 , leaving 56 to be baked on the 3rd day.
check: 56 + 84 + 160 = 300