3. A contractor hires 5 workers who can repair Kunal's house in 8 days. If he uses 8 workers instead of 5, how long should they take to complete the job?

4. In a bicycle company, it requires 36 machines to produce a certain number of bicycles in 54 days. How many machines would be required to produce the same number of bicycles in 81 days?



Answer :

Final answer:

The answer provides calculations for both scenarios using workers-speed-time and machines-speed-time formulas.


Explanation:

To calculate the time needed for 8 workers to complete the job:

  1. For 5 workers, the job takes 8 days.
  2. Using the workers-speed-time formula, 5 workers x 8 days = 8 workers x (time needed).
  3. Solving for the time needed, the job would take 5 days for 8 workers to complete.

Regarding the machines needed to produce bicycles:

  1. With 36 machines, the job takes 54 days.
  2. Using the machines-speed-time formula, 36 machines x 54 days = x machines x 81 days.
  3. Solving for x, the same number of bicycles could be produced in 81 days with 24 machines.

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