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25% of the students in a school are girl...

25% of the students in a school are girls and others are boys. Form an equation and draw a graph for this. By observing the graph, answer the following :
(i) Find the number of boys, if the number of girls is 25.
(ii) Find the number of girls, if the number of boys is 45.
(iii) Take three different values for number of boys and find the number of girls. Similarly take three different values for number of girls and find the number of boys?

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