Quantitative Aptitude - Arithmetic Ability Questions

The diagonal of a square is 12 cm what is the length (in cm) of its side?

If the parallel sides of a trapezium are 8 cm and 4 cm, M and N are the mid points of the diagonals of the trapezium, then length of MN is

If (X/4) = (Y/5) = (Z/9), then what is X : Y : Z?

P, Q and R together can make a table in 40 minutes. P and Q together can make it in 60 minutes. How much time (in minutes) will R alone take to make the table?

What is the value of sin ­7π/4c?

Both X and Y together can complete a work in 12 days and Y alone can complete the same work in 30 days. In how many days will X alone complete the work?

The distance between the points (7,7) and (k,-5) is 13. Find k?

Find the LCM of 12, 16, 20 and 24.