21.
On a certain map of India the actual distance of 1450 km between two cities Delhi and Kolkata is shown as 5 cm. What scale is used to draw the map ?

22.
A flagstaff 17.5 m high caste a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be ?

23.
A man completes $$\frac{5}{8}$$ of a job in 10 days. At this rate, how many more days will it take him to finish the job ?

24.
56 men can complete a piece of work in 24 days. In how many days can 42 men complete the same piece of work ?

25.
30 men can do a piece of work in 16 days. How many men would be required to do the same work in 20 days ?