What is a blood type?
A person’s blood type is described by a letter (A, B, AB or O) and can either be positive or negative. The most common blood type is O+ and the rarest is AB-. This post will help you understand the maths involved in the blood type topic in Prelim Standard Math.
How do you calculate probability involving percentages?
The video below explains how to do questions relating to blood type that involve percentages.
How to calculate percentage problems with blood types
The following video explains percentages further.