There are 25 students in a class with 15 boys and 10 girls. The class teacher selects either a boy or a girl for monitor post of the class. In how many ways, the class teacher can make this selection?
Question
There are 25 students in a class with 15 boys and 10 girls. The class teacher selects either a boy or a girl for monitor post of the class. In how many ways, the class teacher can make this selection?
Solution
The teacher has two options for the monitor post: either a boy or a girl.
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If the teacher decides to select a boy, there are 15 boys in the class. So, there are 15 ways to select a boy.
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If the teacher decides to select a girl, there are 10 girls in the class. So, there are 10 ways to select a girl.
Therefore, the teacher can make the selection in 15 (ways of selecting a boy) + 10 (ways of selecting a girl) = 25 ways.
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