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Examples Let's say there are some boys and girls in a school hall.
If we want to find out the total number of children, we must first know the number of boys and the number of girls. If we are told that there are 20 boys and 30 girls, then we can calculate the total number of children. So, there are 50 children. We can still write a Mathematical expression for the total number of children. First, we use a letter, say x , to represent the number of boys.