It take sally 2.5 hours to clean her floor. How much of the floor will have sally cleaned after only 1 hour.
1 hour = 60 min
2.5 hours =150min
60/150 =.4
so sally can clean .4 of 40% of her floor at 1 hour.
1 hour = 60 min
2.5 hours =150min
60/150 =.4
so sally can clean .4 of 40% of her floor at 1 hour.