Quantitative Aptitude - Arithmetic Ability Questions

What is the distance between the points (11,-5) and (-1,0)?

In a camp 180 students had ration for 20 days. How many students should leave the camp if the ration should last for 25 days?

Amit's age is four times the age of Babli. Babli's age is three times the age of Priya. If the present age of Priya is 5 years, what is the present age (in years) of Amit?

Among four students sitting in a row, average age of last three students is 20 years and the average age of first three students is 21 years. If the age of first student is 26 years, then what is the age (in years) of the last student?

The value of (1 - √2) + (√2 - √3) + (√3 - √4) + ..... + (√15 - √16) is

Sec 45% + Tan 30% =

What is the value of {sin (90 – x) cos [π – (x – y)]} + {cos (90 – x) sin [π – (y – x)]}?

x, y and z are real numbers. If x3 + y3 + z3 = 13, x + y + z = 1 and xyz = 1, then what is the value of xy + yz + zx?