Answer:
d = 84
Step-by-step explanation:
When 21 workers build a house in 36 days, we know the product of the number of workers and the number of days is constant.
So, 36 days multiplied by 21 workers equals a constant value.
36 multiplied by 21 equals 756, which is our constant value.
Now, to find out how many days it would take to build the house with 9 workers:
We take the constant value (756) and divide it by the number of workers (9).
756 divided by 9 equals 84.
So, it would take 84 days to build a similar house with 9 workers.
