Quantitative Aptitude - Arithmetic Ability Questions

Two points P and Q are at the distance of x and y (where y > x) respectively from the base of a building and on a straight line. If the angles of elevation of the top of the building from points P and Q are complementary, then what is the height of the building?

If the value 5 = 2.236,then calculate the value of 405 - 1280-125

The distance between the centres of two circles is 61 cm and their radii are 35 cm and 24 cm. What is the length (in cm) of the direct common tangent to the circles?

What is the slope of the line, perpendicular to the line 3x - 6y = 4?

Which of the numbers given below is the square root of 15376?

Deepinder lent Rs 8200 to Jairaj for 16 years and Rs 4900 to Karna for 15 years on simple interest at the same rate of interest and received Rs 19446.5 in all from both of them as interest. The rate of interest per annum is:

A batsman in his 12th innings makes a score of 120, and thereby increase his average by 5. The average score after 12th innings is

If x+1x = 2, then x2+1x2 = ?