Quantitative Aptitude - Arithmetic Ability Questions

P and Q can do a project in 12 and 12 days respectively. In how many days can they complete 50% of the project if they work together?

What is the value of tan­ -240°?

If x+y+z = 1, 1/x + 1/y + 1/z = 1 and xyz = -1, then x3+y3+z3 is equal to

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?

How many times in a week does both the hands of the clock will coincide with each other?

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given options.

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

If (a + b)/c = 6/5 and (b + c)/a = 9/2, then what is the value of (a + c)/b?