Quantitative Aptitude - Arithmetic Ability Questions

After excluding stoppages, the speed of a bus is 60 kmph and after including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

Ticket for an adult is Rs 1200 and a child is Rs 800 respectively. One child goes free with two adults. If a group has 25 adults and 5 children what is the discount the group gets?

Select the odd word/letters/number/number pair from the given alternatives.

The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?

A solid cone of height 36 cm and radius of base 9 cm is melted to form a solid cylinder of radius 9 cm and height 9 cm. What percent of material is wasted this process?

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel. 
What is the area of triangle ADC?

If 2+x+2-x2+x-2-x=2,then the value of X is

If the average age of four children is 12 years and the average age of these children and their fathers is 20 years, what is the age of the father?