Final answer:
To calculate the number of extra members needed in a bulb manufacturing co-operative factory to supply the bulbs according to the agreement, we can use the concept of work done and set up a proportion. Plugging in the given values, we find that 60 extra members need to be appointed.
Step-by-step explanation:
To calculate how many extra members need to be appointed to supply the bulbs according to the agreement, we can use the concept of work done. We can set up a proportion to compare the work done in the original time frame to the work needed to be done in the new time frame:
(Original Members)(Original Time) = (New Members)(New Time)
Plugging in the values from the question:
(45 members)(12 days) = (New Members)(9 days)
Now we can solve for the number of new members needed:
New Members = (45 members)(12 days) / (9 days)
New Members = 60 members
So, 60 extra members need to be appointed to supply the bulbs according to the agreement.