Quantitative Aptitude - Arithmetic Ability Questions

10 persons can do a job in X days. If 20 persons with twice the efficiency can do the same job in 5 days, then find the value of X?

If 3a+4b3c+4d = 3a-4b3c-4d, then 

If x2 – 4x + 1 = 0, then what is the value of x9 + x7 – 194x5 – 194x3?

In a company 2/3 of the workers are girls, 1/2 of the girls are married and 1/3 of the married girls live in hostel. If 3/4 of the boys are married and 2/3 of married boys live in hostel. Calculate the part of workers who don’t live in hostel.

If a + b = 1 and ab = -6, then what is the value of a3+ b3?

Select the odd word/letters/number/number pair from the given alternatives.

X alone can do a piece of work in 12 days and Y alone can do the same work in 6 days. In how many days will both together complete the same work?

The radius of base of a solid cylinder is 7 cm and its height is 21 cm. It is melted and converted into small bullets. Each bullet is of same size. Each bullet consisted of two parts viz. a cylinder and a hemisphere on one of its base. The total height of bullet is 3.5 cm and radius of base is 2.1 cm. Approximately how many complete bullets can be obtained?