Quantitative Aptitude - Arithmetic Ability Questions

The difference between the simple interest obtained by investing Rs. 'X' with 8% per annum for an year and by investing Rs. 'X+1400' with 8% per annum for two years is 240 Rs. Find the value of X.

A store sells a watch for a profit of 25% of the cost. Then the percentage of profit against selling price is

The standard deviation of the set {10, 11, 9, 11, 9} is

(1155) +(18 − 6) × 9 =?

A shopkeeper allows a discount of 20% to his customers and still gains 25%. Find the Marked price of an article which costs Rs.600 to the shopkeeper.

Three bottles of equal capacity containing mixture of milk and water in ratio 2 : 5, 3 : 4 and 4 : 5 respectively. These three bottles are emptied into a large bottle. What will be the ratio of milk and water respectively in the large bottle?

The brother is elder to his sister by 6 years. Seven years ago the product of their ages was 72. What is the age of the brother?

Find the LCM of 3.2, 2.72, 1.28 and 1.44