The beginning number of acres was 100; adding 40 more brought that to 140 acres. This was an increase. Dividing the increase (40) by the starting value (100) yields 0.40. Finally, multiplying this result by 100% yields 40%.
all u have to do is solve the first part 48/6 which equals 8 and time that by 24. if u want to go deeper into it and show that u really understand then check ur work by dividing 192 by 24 which of course equals 8