Wipro Company Numerical Ability Time and Work

25 men take 25 days to construct a wall 10 meter high. How many men would be required to construct a similar wall which is 8 meter high, if it is planned that the work would be completed in 10 days?

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Wipro Other Question

20 cows and 40 goats can be kept for 10 days for $460. What would be the cost of keeping 50 cows and 30 goats for 12 days if the cost of keeping 5 goats is the same as cost of keeping 1 cow? P can complete a piece of work in 20 days and Q in 30 days. P worked alone for 4 days and then Q completed the remaining work along with R in 18 days. In how many days can R working alone complete the work?