Quantitative Aptitude - Arithmetic Ability Questions

Which single discount will be equal to two successive discounts of 12% and 5%?

The length of the diagonal and the breadth of a rectangle are 17 cm and 8 cm respectively. Find its perimeter (in cm).

What is the area (in sq cm) of a regular hexagon of side 6 cm?

2cos[(C+D)/2]sin[(C-D)/2] is equal to

X alone can do a piece of work in 12 days and Y alone can do the same work in 6 days. In how many days will both together complete the same work?

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

Find the simple interest on Rs. 50 for 6 months at the rate of 10 paise per rupee per month.

The average marks in science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?