Quantitative Aptitude - Arithmetic Ability Questions

The value of -261+(-380)-(-521)+821-(-121)

The sum of present age of father and his son is 60 yrs. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be?

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

Simple interest on a certain sum of money for 3 years at 14% per annum is half the compound interest on Rs. 10000 for 2 years at 10% per annum. The sum placed on simple interest is

A sum of Rs 4000 becomes Rs 7000 in 6 years at simple interest. If the rate of interest becomes double of itself, then what will be the amount (in Rs) after 6 years?

Which one of the following is the minimum value of the sum of two integers whose product is 24?

The centroid of an equilateral triangle ABC is G. If AB is 6 cms, the length of AG is

Find the odd word/letters/number from the given alternatives.