Quantitative Aptitude - Arithmetic Ability Questions

If cosx.cosy + sinx.siny = -1 then cosx + cosy is

Four pairs of words are given. Find the odd one out.

At what percentage above the cost price must an article be marked so as to gain 33% after allowing a customer a discount of 5%?

Find the odd word / letter / number from the given alternative

Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

Manjeet can do a work in 18 hours. If he is joined by Jaya who is 100% more efficient, in what time will they together finish the work?

P does half as much work as Q in 1/3 of the time. If together they take 15 days to complete a work, how many days will P take to do it alone?

Simple interest on a certain sum of money for 3 years at 10% per annum is half the compound interest on Rs 6000 for 2 years at 10% per annum. The sum placed on simple interest is