Answer: The farmers have to plough 1680 acres of land.
Step-by-step explanation:
Let the expected time to complete the plowing be 'x'.
In x days, a group of farmers had to plough = 112 acres
According to question, on exceeding the schedule by 8 acres per day, the farmers finished plowing one day earlier than expected.
So, New time = x-1
Number of acres of land becomes

So, According to question, it becomes,

So, Total acres of land the farmers have to plough is given by

Hence, the farmers have to plough 1680 acres of land.