Quantitative Aptitude - Arithmetic Ability Questions

Three years ago, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is

X alone can do a piece of work in 12 days and Y alone can do the same work in 6 days. In how many days will both together complete the same work?

Calculate the value of √3√3 + 3, if √3 = 1.732

From a point P on a level ground , the angle of elevation to the top of the tower is 30° . If the tower is 100m high , the distance of point P from the foot of the tower is ( Take √3 = 1.73)

If a retailer offers a discount of 32% on the marked price of his goods and thus ends up selling at cost price, what was the % markup price?

On a certain principal if the simple interest for two years is Rs 1400 and compound interest for the two years is Rs 1449, what is the rate of Interest?

When a number is increased by 105, it becomes 135% of itself. What is the number?

What number should be added to each of the numbers 55, 100, 65 and 116, so that the resulting numbers are in continued proportion?