Quantitative Aptitude - Arithmetic Ability Questions

A, B and C can do job in 9, 12 and 36 days respectively if they worked alone. A leaves after they have worked together for 3 days. In how many days can B and C do the rest of the job?

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?

Average of all even numbers between 222 and 250 is __________.

What is the average of all the one digit and two digit natural numbers?

If a + a2 + a3 – 1 = 0, then what is the value ofa3 + (1/a)?

The ten's digit of a 2­digit number is greater than the units digit by 4. If we subtract 36 from the number, the new number obtained is a number formed by interchange of the digits. Find the number.

If 2y cosθ = x sinθ and 2x secθ - y cosecθ = 3 then what is the value of x2+4y2

If the shopkeeper sells an item at Rs 1250 which is marked as Rs 1500, then what is the discount he is offering?