Quantitative Aptitude - Arithmetic Ability Questions

The solution set of 4x - 3y = 47 and 3x + y = 32 is

The sum of 4x + 3y ­ 7z, x ­ y ­ z and ­2x ­ 3y + 4z is

Find co-ordinates of the mid point of the segment joining points C (3,-5) and D (-7,3).

A rectangular playground ground of length 125 m and width 75 m, has a walking strip of width 3 m in the middle of the ground, along the longer side. What is the area of the ground without the walking strip?

Five men or ten women can complete a job in 20 days. In how many days can 3 men and 4 women complete it?

If 4r = h + r2+h2 then r: h = ? (r not equal to 0)

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

What is the average of 90, 250, 240, 204, and 616?