Quantitative Aptitude - Arithmetic Ability Questions

The marked price of a shirt is twice of the cost price. To earn a gain of 25%, what should be the discount percentage?

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.

What approximate value should come in place of the question mark (?) in the following questions? (You are not expected to calculate the exact value.)

21.003 × 39.998 –209.91 = 126× ?

If 1/(cosecA ­ cotA) = x, then the value of x is

Which of the following will yield a reclining decimal?

A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then what fraction of work is left?

Mr. Murthy invested Rs. 16,000 in a scheme. How much will he get on matuirity, if he invested it at 20% per annum C.I. for 9 months, compounded quarterly?

A train of length 100 m crosses another train of length 150 m, running on a parallel track in the opposite direction in 9 seconds. If the speed of trainhaving length 150 m is 40 km/hr, then what is the speed (in km/hr) of the other train?