Quantitative Aptitude - Arithmetic Ability Questions

If 3a+4b3c+4d = 3a-4b3c-4d, then 

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).

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

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)

Dipali bought a set of cups for Rs. 375, but then had to sell it later to clear old stocks for Rs. 345. What is the percentage of loss that she incurred?