Quantitative Aptitude - Arithmetic Ability Questions

4 years ago, the respective ratio between 1/2 of A’s age at that time and four times of B’s age at that time was 5 : 12. Eight years hence 1/2 of A’s age at that time will be less than B’s age at that time by 2 years. What is B’s present age ?

If cot A = [sin B/(1 – cos B)], then what is the value of cot 2A?

If a watch is being sold at Rs 7,225 which is marked at Rs 8,500, then what is the discount (in %) at which the watch is being sold?

Solve the following : -1/4 { -45 - (-96) / (-32)} = ?

If two successive discounts of 20% and 30% are given, then what is the net discount (in %)?

The sum of the ages of brother and sister at present is 21. Five years ago the product of their ages was 28. What is the age of the brother and the sister?

When a number is increased by 24, it becomes 115% of itself. What is the number?

If the radius of a circle is increased by 17% its area increases by ______.