Quantitative Aptitude - Arithmetic Ability Questions

The average of 100 observations was calculated as 35.It was found later, that one of the observation was misread as 83 instead of 53. The correct average is :

2*[­0.3(1.3 + 3.7)] of 0.8 = ?

The inradius of a equilateral triangle is 10 cm. What is the circum-radius (in cm) of the same triangle?

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

A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed . If the average speed is 6.4 km/hr in total , then the return speed (in km/hr) is

24 men can do a piece of work in 17 days.How many men will be able to do it in 51 days ?

Convert binary 1101111 to decimal.

The total surface area of a hemisphere is 4158 cm2. Find its diameter (in cm).