Quantitative Aptitude - Arithmetic Ability Questions

P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

9 hrs after a goods train passed a station, another train travelling at a speed of 72 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 3 hours. What is the speed of the goods train?

Three consecutive integers form the lengths of a right-angled triangle. How many sets of such three consecutive integers is/are possible?

A sum of Rs. 3000 yields an interest of Rs. 1080 at 12% per annum simple interest in how many years ?

A sum fetched a total simple interest of Rs 5320 at the rate of 7% per year in 5 years. What is the sum?

HCF of two numbers is 19 and their LCM is 665. If one of the number is 95, find the other.

If a+bab=21 ,  then the value of (a-b) is