Question

195 men working 10 hours a day can finish a job in 20 days . how many men are employed to finish the job in 15 days if they work 13 hours a day ​

Answer 1

Step-by-step explanation:

Let us analyse the problem. As the number of men increases, number of days required will decrease. Similarly, if the number of working hours increases the number of days decreases. Hence the number of days is inversely proportional to the number of men and number of working hours. Hence the constant of proportionality is k=195×20×10.

Let x be the number of men, working 13 hours a day, required to finish the job in 15 days. Then 15 is inversely proportional to both x and 13. This gives k=x×13×15. Comparing two expressions for k, we obtain x = 195 × 20 × 10 / 13 × 15 = 200.

Thus the required men is 200.

Answer 2

Answer:

total man hours=

number of days x (manpower x hours per day)

total man hours=20x(195x10)

total man hours=39000

Now change the numbers:

39000=15x(manpower x 13)

Divide by 15

2600=manpower x 13

Divide by 13

200=manpower

So it'll take 200 men.