Time And Work

Step 1: Concept
Time and Work formula: .
Step 2: Meaning
M = Workers, D = Days, W = Work (Breads).
Step 3: Analysis
- Given: - Target: - - - .
Step 4: Conclusion
Hence, 12 workers are required.
Final Answer:(B)

A can complete the work in 9 days, so A's work per day . B can complete the work in 12 days, so B's work per day . They work on alternate days starting with A. Work done on the 1st day (by A) Work done on the 2nd day (by B) Work done in the first 2 days In 10 days (5 pairs of days), the work done Remaining work On the 11th day, A will work. A's work per day is . Since the remaining work is , which is less than , A will finish the remaining work on the 11th day. Let the number of days A works on the 11th day be . Work done by A on the 11th day $ $ So, the total time taken to complete the work is 10 full days + day days.

Calculate total work in boy-hours: Let be the number of additional boys needed, so total boys = . The new work schedule is 12 days, 4 hours/day, so: