List of top General Aptitude Questions on Area of a Triangle

What can be placed at ‘?’ if both sides of ‘::’ have the same relationship between numbers:
85 : 42 :: 139 : ?

If a person buys 15 pencils for ₹12, and sells 12 pencils for ₹15, find the gain or loss percentage.

A cylinder has radius $7\text{ cm}$ and height $10\text{ cm}$. Find its curved surface area. [$\text{CSA} = 2\pi rh$]