Quantitative Aptitude - Arithmetic Ability Questions

U, V and W together can make a chair in 20 minutes. U and V together can make it in 25 minutes. How much time will (in minutes) W alone take to make the chair?

The height of a tower is 50√3 m. The angle of elevation of a tower from a distance 50 m from its feet is

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

What is the reflection of the point (4, 7) in the line y = -1?

Select the odd letters from the given alternatives.

Find the value of 27a3 + 1a3, if 9a2 + 1a2 = 43

The difference between Peter and Preeti's ages is 5 years. When they married each other 35 years ago, 4 times Peter's age was the same as 5 times the age of Preeti. What is the current sum of their ages?

The sum of two digits of a number is 10. If the digits are interchanged, then its value increases by 18. Find the number.