Quantitative Aptitude - Arithmetic Ability Questions

The traffic lights at four different road crossings change after every 15 sec, 18 sec, 27 sec and 30 sec respectively. If they all change simultaneously at 6:10:00 hours, then at what time will they again change simultaneously?

A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area?

What is the value of a-b when a2+b2-6a-6b+18 = 0 ?

What is the equation of the line which intercepts x­axis and y­axis at 3/4 and ­2/3 respectively?

The upper part of a tree broken over by the wind make an angle of 60 deg with the ground. The distance between the root and the point where top of the tree touches the ground is 25 metres. What was the height (in metres) of the tree?

9997 x 10003 = ?

If x + 2(3-5x) > -1 - 2x < 5 - x/3; then the value of x is

In an isosceles trapezium _____.