Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

The simple interest on a sum for 5 years is two­fifth of the sum. The rate of interest per annum is

In the following question, select the odd letter/letters from the given alternatives.

ΔDEF is right angled at E. If m∠F = 30 deg, then find the value of (sinD - 1/3).

If 2560.256 = 25.6x, then what will be the value of x?

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

Of the 3 numbers whose average is 64, the first number is 1/3 times the sum of other 2. The first number is

Cost price of a cooler is Rs 8400. If the profit percentage is 26%, then what is the selling price (in Rs) of the cooler?