A crew of ten workers was hired to complete a job in 8 days. After working for two days, there was a new request to complete this job in two days. How many more workers need to be hired to finish this job in 2 days?

They would need to hire 20 more workers because they are 1/4 of the way done after the first two days. And that means they need to be 3/4 of the way done in the next 2 days, that means they have to be 3 times as productive from the first day and 10 times 3 equals 30, but they already have 10, so 30 - 10 = 20
THEY NEED 20 more workers
I hope it helps