Quantitative Aptitude - Arithmetic Ability Questions

What is the ratio of simple interest earned on certain amount at the rate of 12% for 6 years and that for 12 years?

The median of the numbers 14, 12, 12, 16, 13 and 18 is

A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. Find the average speed.

In the following question, four number pairs are given. The number on left side of (–) is related to the number of 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 alternatives.

What is the area (in sq cm) of a rectangle if its diagonal is 25 cm and one of its sides is 24 cm?

If a2+1a2 = 38, then find the value of a-1a?

Two numbers are 50% and 90% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

If cos2x + cos4x = 1, then tan2x + tan4x =