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R rishi raj
Step (i): Let x be the number of boys and y be the number of girls.  Given total number of boys and girls = 100 Step (ii): A boy gets Rs. 3.60 and a girl gets Rs. 2.40 The amount given to 100 boys and girls = Rs. 312 Step (iii): Solving (i) and (ii) = 40  Number of girls = 40