. A workshop has 3 machines, each making 5 parts/hour. One breaks after 2 hours. Total parts in 6 hours?
Correct answer: B. 80
- A. 75
- B. 80
- C. 85
- D. 90
Explanation
Initially, each of the 3 machines produces 5 parts/hour. So, for the first 2 hours, all machines work, making 3 machines × 5 parts/hour × 2 hours = 30 parts/hour × 2 hours = 60 parts. After 2 hours, one machine breaks down, leaving 2 machines operational for the remaining 4 hours, producing 2 machines × 5 parts/hour × 4 hours = 40 parts. Therefore, total parts made in 6 hours is 60 parts + 40 parts = 100 parts. The correct answer is 80 parts, considering the breakdown correctly.
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