Quantitative Aptitude - Arithmetic Ability Questions

A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then what fraction of work is left?

X and Y undertook to do a piece of work for Rs 5400. X alone could do this work in 18 days and Y alone could do this work in 24 days. With the assistance of Z they finished the work in 8 days. What is the share (in Rs) of Z?

If 8/5 of 4/3 of a number is 192, then 5/6 of that number is

What is the effective discount on two successive discounts of 20% and 25%?

In the given series of numbers how many 7's are there which are immediately followed by 9 and immediately not preceeded by 5 ?

A man can row his boat at a speed of speed of 4 kmph and he finds that the time taken rowing upstream is double to that taken downstream. Find the speed of the stream (in kmph).

A man spends 59% of his income and saves the rest. What percentage of his expenditure does he save?

X and Y give an exam. Difference of their marks is 45 and the difference of their marks is 15% of the maximum marks. What is the maximum marks for the exam?