Maria mowed 0.25 of the lawn, her daughter mowed 0.2 of the lawn, and her son mowed 25% of the lawn. Ifthe area of the lawn is 300 square feet, how much area is left to mow

0.25 is the same as 25/100 or 1/4, which is 25%. Similarly, 0.2 is the same as 20/100 or 1/5, which is 20%. So 20% + 25% + 25% = 70% of the lawn has already been mown, which means there is only 30% left to mow. To find out 30% of 300, just do 300 : 10 = 30 (10%) * 3 = 90 (30%). So, there is only 90ft² left of the lawn to mow.