1. 12 workers can build a wall in 10 days. How many days will 15 workers take, working at the same rate?
- A12 1/2 days
- B8 days
- C13 days
- D7 days
Show answer
Answer: B) 8 days
Work = worker-days. days. More workers, fewer days.
Class 8 Workers, Days and Hours — practice questions with answers
Direct and Inverse Proportions · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. A camp has food for 80 people for 30 days. After 10 days, 30 people leave. How long will the rest of the food last the remaining people?
- A20 days
- B12 days
- C32 days
- D25 days
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Answer: C) 32 days
Left: person-days for 50 people: days.
3. If 3 cows graze a field in 12 days, in how many days will 9 cows graze the same field?
- A36 days
- B6 days
- C4 days
- D3 days
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Answer: C) 4 days
cow-days; days.
4. A carpenter takes 6 hours to make 2 chairs. How many chairs can 5 carpenters make in 12 hours?
- A10 chairs
- B20 chairs
- C12 chairs
- D30 chairs
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Answer: B) 20 chairs
One carpenter: chair per hour. .
5. If 9 printers print 900 posters in 5 hours, how long would 6 printers take for 1,200 posters?
- A10 hours
- B5 hours
- C7 1/2 hours
- D8 hours
Show answer
Answer: A) 10 hours
One printer: posters an hour. 6 printers: 120 an hour. hours.
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