Hi M7MBA,
Let's take a look at your question.
The question states:
"If it takes 50 workers 8 hours to build a log cabin, how long would it have taken 30 workers to build the same cabin? "
50 workers build a log cabin = 8 hours
If we want to calculated how many hours will one worker take to build that cabin, we will be using the multiplication, since one worker will have to work more than 50 workers. Therefore,
1 worker will build the log cabin = 50 x 8 = 400 hours
Now, we need to find out how many hours 30 workers will take to build the same log cabin. Since 30 workers are more than 1 worker, so they will take less time and hence we will be using the division to find the number of hours.
30 workers will build the log cabin = 400/30 = 13.33 hours.
Therefore 30 workers will take 13.33 hours which means 13 complete hours and some more minutes. Let's see in the given options to find out the closest value to 13.33 hours i.e. 13 hours and 20 minutes.
Therefore, Option E is correct.
Hope it helps.
I am available, if you'd like any follow up.
