Quantitative Aptitude - Arithmetic Ability Questions

The rate of simple interest per annum at which a sum of money double itself in 16 2/3 yrs is

A man was 32 years of age when he had his first son. His wife was 35 years of age when his son attained the age of 7 years. The difference between the age of the father and the mother is _____

The ten's digit of a 2-digit number is greater than the units digit by 7. If we subtract 63 from the number, the new number obtained is a number formed by interchange of the digits. Find the number.

In a triangle XYZ , which of the following conditions is true

A wholesaler sells a jacket to a retailer at a profit of 5% and the retailer sells it to a customer at a profit of 10%. If the customer pays Rs. 4158, what had it cost (in Rs) to the wholesaler?

If 1-aa3+9 = 19 - a1-a3, then what is the value of a?

A can complete a task alone in 8 days, while B takes 12 days to do it by herself. Together with C it takes them 4 days to complete the work. If C and D together can complete the task in 15 days, then how many days will D need to complete the task by herself?

If tan(A/2) = x, then the value of x is