On teacher’s day 3200 sweets were to be equally distributed amongst a certain number of children. But on that particular day 80 children remained absent, hence each child got 2 sweets extra. How many children were originally supposed to be there ?
Let 'x' be the original number of students.
$$\frac{3200}{x-80}-\frac{3200}{x}=2$$
Substituting options, we see that only x=400 satisfies the equation. Hence, option D is the right answer.
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