Quantitative Aptitude - Arithmetic Ability Questions

If a + b = 5 and ab = 6, then what is the value of a3 + b3?

The sum of two positive integers is 80 & difference between them is 20. Then what is difference of squares of those numbers ?

The difference between compound interest and simple interest on Rs. 5000 for 2 years at 8% per annum payable yearly is

A 145 m long train crosses a 655 m long bridge in 36 seconds. What is the speed of the train?

Raghuram sells a machine for Rs 43 lakhs at a loss. Had he sold it for Rs 53 lakh, his gain would have been 7 times the former loss. Find the cost price of the machine.

The average of three numbers is 40. First number is 4/3 of the third number. If third number is 20 less than second number, then what is the value of second number?

A 800 metres long train is running at the speed of 90 km/hr. If it crosses a bridge in 50 seconds, then what is the length (in metres) of the bridge?

Some carpenters promised to do a job in 15 days but 3 of them were absent and remaining did the job in 20 days. What was the original number of carpenters?