Quantitative Aptitude - Arithmetic Ability Questions

The surface area of a sphere is 5544 cm2. Find its diameter (in cm).

In triangle ABC, O is the orthocenter and angle BOC is 120 deg. Calculate angle BAC.

The area of a circle is 38.5 cm2. Find its circumference (in cm).

P can do a piece of work in 60 days & Q can do the same work in 50 days. Find the ratio of working efficiencies of P to Q.

At 8% simple interest per annum a sum of money becomes Rs. 300 in 2.5 years. What was the sum invested?

Product of digits of a 2-digit number is 24. If we add 45 to the number, the new number obtained is a number formed by interchange of the digits. What is the number?

The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?

The pair of linear equations 3x + y = 1 and px + 2y = 5 has no finite solution if