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?

Let ΔABC and ΔABD be on the same base AB and between the same parallels AB and CD. Then the relation between areas of triangles ABC and ABD will be

If a+1b = 1 and b+1c = 1 then c+1a = ?

Find the Greatest Common Factor of 280 and 144.

The ratio of salary of X, Y and Z is 15 : 3 : 8. If Z gets Rs. 3960 more than Y, then what is the salary (in Rs.) of X?

What is the area (in sq cm) of a regular hexagon of side 9 cm?

The circumference of a circle is 88 cm. Find its radius (in cm).

If u+v = 10 and uv = 16, then find the value of u2-v2uv