Question

If 12 men take 4 hours to complete ajob,how long should it take for 15 men to complete it

Answer 1

Answer:

Step-by-step explanation:

Number of workers ( x ) is  

inverse proportional to working hours ( y )

x1 = 12 , y1 = 4

x2 = 15 , y2 = ?

x2 y2 = x1 y1  

15 × y2 = 12 × 4

y2 = ( 12 × 4 ) /15

y2 = 16/5

y2 = 3.2 hours

Answer 2

Answer: have a look at the picture:

Step-by-step explanation: