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A school has 800 pupils.
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If 400 are boys, how many girls are there?
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The total pupils will equal the number of boys plus the number of girls.
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We have 800 total pupils.
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400 of them are boys.
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And we need to know how many of them are girls.
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400 plus what equals 800?
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Letâ€™s ask the question like this: four plus what equals eight?
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We know that four plus four equals eight.
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And that helps us solve this problem, because we can say 400 plus 400 equals 800.
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There are 400 girls at the school.