Quantitative Aptitude - Arithmetic Ability Questions

The distance between the points (4, 8) and (k,-4) is 13. What is the value of k?

The distance between the tops of two building 38 metres and 58 metres high is 52 metres. What will be the distance (in metres) between two buildings?

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?

7 litres mixture of milk and water contains 30% water. 3.5 litres of milk is added to this mixture. What is the percentage of water in the new mixture?

If 7 + 3x ≥ 5 ­- x/2 and 2x + 3 ≤ 5 -­ 2x; then x can take which of the following values?

If x2-3x+1=0, then x+1x is (x≠0)

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

A basket contains 300 mangoes . 75 mangoes were distributed among some students . Find the percentage of mangoes left in the basket