Quantitative Aptitude - Arithmetic Ability Questions

What is the area (in sq cm) of a rhombus if the lengths of the diagonals are 12 cm and 14 cm?

The measures of the four angles of a quadilateral are in the ratio 3:4:5:6. What is the measure of the biggest angle?

If 5x ­- 40 = 3x, then the numerical value of 2x -­ 11 is

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

What is the value of √121 + √12321 + √1234321 + √123454321?

If x+1x2 = 3, then the value of x3+1x3 is:

The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?

A can do 1/3rd of a work in 5 days and B can do 2/5th of this work in 10 days. Both A and B, together can do the work in