Quantitative Aptitude - Arithmetic Ability Questions

If 5+x+5-x5+x-5-x = 3,then what is the value of x ?

If the perimeter of a semi-circle is 108 cm, then find its radius (in cm).

The ratio of present ages of R and S is 6:7. Before 12 years the ratio of their ages was 9:11. What is R's present age (in years)?

The average salary of male employees in a firm was Rs. 5200 and that of females was Rs. 4200. The mean salary of all the employees was Rs. 5000. What is the % of female employees?

If a+b+c = 0, then (a^3 + b^3 + c^3)^2 = ?

60% of P = 50% of Q and Q = x% of P. What is the value of x?

If Rs. 2,000 is invested at the rate of 20% per annum, compounded half-yearly, then the amount after 18 months will be:

If (x+a) is the H.C.F of 2x2+5x-12 and x2+x-12 then find the value of a.