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Because are 5 boys and 23 girls in class it means that is a mixt class and that is why the people who learn there are caled students or learners. So to find the number of the learners of that class we have to add the number of girls and the number of boys and we obtain the students number.

The number of learners is:

5+23=28 learners are in the class

28 are the learners in the class