Sunday, March 13, 2011

Time and Work class-8th

Class 8th Time and Work-1
  1. Ramdin can reap a field in 30 days. What part of the field would he have reaped in 25 days? 
  2. If 12 men working 8 hours a day can construct a shed in 5 days, then in how many days will 8 men working 10 hours a day complete the same job? 
  3. Three ants separately can gobble a dead grasshopper in 3, 4 and 6 days respectively. How many days will they take together to finish off the poor chap? If the grasshopper weighs 63 grams, find the share of each. 
  4. If a chicken lays an egg and a half in a day. how long does it take to get a dozen eggs from a chicken? 
  5. A dozen pens cost 15 rupees. How much would a hundred pens cost? 
  6. 400 grams cake costs 80 rupees. How much would a 1.5 kg cake cost? 
  7. It rained 80 mm in first 20 days of April. What would be the total rainfall in April? 
  8. 50 grams of fish food is sufficient for 8 fish for a day. How much would 12 fish require in a day? 
  9. 50 grams of fish food is sufficient for 8 fish for a day. On the same amount of food, for how many days can 2 fish survive? 
  10. A man builds a chair in 4 days, working 6 hours a day. How many hours should he work in a day if he wants to do it in 3 days instead of 4 days? 
  11. Four men working together take 3 hours to paint a wall. How much time would 6 men take to do the same job? 
  12. A man earns Rs 18000 in 3 months.(a) How much time would he take to earn Rs 30000?(b) How much will he earn in 7 months? 
  13. Ram can build a table in 6 days while Shyam requires 8 days for the same work. Working together, (a) how many days would they require to construct 7 tables? (b) How many tables can they construct in 48 days? 
  14. A man and a woman working together can sow a field in 20/9 days. The man alone can do it in 4 days. How much time would the woman working alone take to sow the field? 
Answers: 1. 5/6th 2. 6 days 3. 1 and 1/3 days, 28 grams, 21 grams, 14 grams 4. 8 days
5. Rs. 125 6. Rs. 300 7. can not say 8. 75 grams 9. 4 days 10. 8 hours per day 11. 2 hours 12. (a) 5 months (b) Rs 42000 13. (a) 24 days (b) 14 tables 14. 5 days

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