Quantitative Aptitude - Arithmetic Ability Questions

The difference of compound interest and simple interest for 3 years and for 2 years are in ratio 23 : 7 respectively. What is rate of interest per annum (in %)?

Excluding stoppages, the speed of a train is 120 kmph and including stoppages, it is 50 kmph. For how many minutes does the train stop per hour?

The sum of the ages of brother and sister at present is 21. Five years ago the product of their ages was 28. What is the age of the brother and the sister?

If a certain sum of money become thrice of itself in 5 years 4 months at simple interest, then what will be the yearly rate of interest (in %)?

If two successive discounts of 20% and 30% are given, then what is the net discount (in %)?

The minimum value of LCM of given numbers is ........... the product of all the given numbers.

Rs.7750 is divided among X, Y and Z such that 3 times of X's share is equal to 5 times of Y's share which is equal to 2 times of Z's share. What is the share (in Rs) of Z?

P and Q can do a project in 6 and 12 days respectively. In how many days can they complete 25% of the project if they work together?