Quantitative Aptitude - Arithmetic Ability Questions

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

P and Q can do a project in 20 and 12 days respectively. In how many days can they complete 40% of the project if they work together?

The sum of a non-zero number and ten times its reciprocal is 7. Find the number.

When a discount of 25% is given on a box of popcorn, the profit is 25%. If the discount is 10%, then the profit is

Select the odd number from the given alternatives.

If the equation 4x + 3y + 5 = 0 and 6x - ky - 7 = 0 have no solution, then the value of k is

What is the value of x3-1x3+8 when 8x-8x-16=0 ?

A bank offers 20% compound interest per half year. A customer deposits Rs 6000 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is