Quantitative Aptitude - Arithmetic Ability Questions

How many times the keys of a typewriter have to be pressed in order to write numbers from 121 to 1346?

445 of 229.79 = ? of 2398.51

The area of a square is 100 sq cm, find length of its diagonal?

A hydrogen filled balloon ascending at the rate of 18 kmph was drifted by wind. Its angle of elevation at 10th and 15th minutes were found to be 60° and 45° respectively. The wind speed (in whole numbers) during the last five minutes, approximately, is equal to

A can finish a work in 18 days and B in 36 days. If they work on it together for 9 days, then what percent of work is left?

If the radius of the cylinder is increased by 25%, then by how much percent the height must be reduced, so that the volume of the cylinder remains same?

If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?

If A and B together do a job in 7.5 days and if A could do the job in 10 days if he worked alone. How many days would B take to do the job if he worked alone?