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If a piece of work could be completed in 24 days by 98 men, how many men would it take to complete it in 21 days?

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Important Questions on Ratio and Proportion

MEDIUM
A contractor takes a contract to complete a road in 60 days and employed 70 labourers. After 25 days, he found that one fourth of work is completed. How many more labours he required to complete the remaining work in time?
MEDIUM
40 persons take 6 days to complete a certain task working 10 hours a day. How many hours a day will be sufficient for 30 persons to complete the same task in 10 days?
MEDIUM
One man, 3 women and 4 boys can do a piece of work in 96 hours; 2 men and 8 boys can do it in 80 hours; and 2 men and 3 women can do it in 120 hours. In how many hours can it be done by 5 men and 12 boys?
EASY
20 men completed one third of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days?
EASY
A work was started by a certain number of men, who completed the work in 15 days. Had there been 4 men less, they would have taken 3 more days to complete the work. Find the number of men.
EASY
A garrison of 2200 men has provision for 16 weeks at 4.5 kg per day per man. How many men must leave so that the same provision may last for 24 weeks at 3.3 kg per day per man?
MEDIUM
If four men or eight women or 10 boys can finish a work in 12 days each of 10 h, then find the minimum number of men, who with the help of four women and 5 boys can finish the work in 4 days each of 8 h?
EASY
42 men take 25 days to dig a pond. If the pond would have to be dug in 14 days, then what is the number of men to be employed?
MEDIUM
If 20 men working for 7 hours a day can do a piece of work in 10 days, in how many days will 15 men working for 8 hours a day do the same piece of work?
MEDIUM
40 men can build a wall 20m high in 15 days. The number of men required to build a similar wall 25m high in 6 days will be _____.
MEDIUM
2 men and 7 boys can do a piece of work in 14 days. 3 men and 8 boys can do the same work in 11 days. 8 men and 6 boys can do 3 times the amount of work in.
EASY
60 men working 7 hours per day can do a piece of work in 40 days. In how many days can 20 men working 7 hours a day do the same piece of work? 
MEDIUM
Three men can do as much work as 5 boys; and the wages of 3 boys are equal to those of 2 men. A work on which 40 boys and 15 men are employed takes 8 weeks and costs Rs. 15750, How long would it take if 20 boys and 20 men were employed, and how much would it cost?
EASY
If 12 boys can earn 240 in 5 days, how many boys can earn 420 in 21 days?
EASY
If 5 men and 3 boys can reap 23 hectares in 4 days and if 3 men and 2 boys can reap 7 hectares in 2 days, how many boys must assist 7 men in order that they may reap 45 hectares in 6 days?
EASY
If (4/5)th of a cistern is filled in 1 minute . How much time is required to fill the remaining part of this ?
MEDIUM
 If p men working p hours a day can do p units of a work in p days, while d men working d hours per day can do how many units of work in d days?
MEDIUM
Type 1 workers are 2.5 times as efficient as Type 2 workers. Twelve Type 1 workers can complete a task in 10 days. How many days would it have taken 4 Type 1 and 15 Type 2 workers to do the same work?
EASY
If the rent for grazing 40 cows for 20 days is Rs.370, how many cows can graze for 30 days on Rs.111?