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Let the number of girls be g. The total number of students = 25 + g. The total marks of boys = 25 × 72 = 1800. The total marks of girls = g × 84. The total marks of the group = 78 × (25 + g). From the data: 1800 + 84g = 78(25 + g). 1800 + 84g = 1950 + 78g. 84g - 78g = 1950 - 1800. 6g = 150. g = 150 / 6 = 25. Correct option: b
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