Quantitative Aptitude - Arithmetic Ability Questions

An item is sold at two successive gains of 30% and 20%. If the final selling price is Rs 31200, then what is the cost price (in Rs)?

Ticket for an adult is Rs 1600 and a child is Rs 1200. 1 child goes free with two adults. If a group has 23 adults and 10 children what is the discount the group gets?

If xy = 56 and x2+ y2= 113, then what will be the value of (x + y)?

Find the fourth proportional to 2, 3, 6.

The cost price of 60 articles is same as the selling price of x articles. If there is a profit of 20%, then what is the value of x?

Two pipes, when working one at a time, can fill a cistern in 3 hhrs and 4 hrs, resp while a third pipe can drain the cistern empty in 8 hrs. All the three pipes were opened together when the cistern was 1/12 full. How long did it take for the cistern to be completely full?

If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?

6 times a fraction is greater than 7 times its reciprocal by 11. What is the fraction?