Answer: 12.8 days
Step-by-step explanation:
x = number of days
y = number of men
The values of x and y are inversely proportional. This means as x goes up, y goes down, and vice versa. If you hire more men, then it will take less days. Having fewer workers means it takes more time.
The equation that connects the two variables together is y = 192/x. If we plugged in x = 6, then we'd get y = 32.
Plug in y = 15 and solve for x and you should get x = 12.8
It takes 12.8 days for 15 men to do the job.