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Step-by-step explanation:
total no of students = X
no of girls. = 3/7 x. .(1)
no of boys = 240
no of girls = X - 240. .(2)
equate 1 and 2
3/7 x = x-240
X. = -240* 7/3
X = -60 * 7
X = 420. (X can't be negative)
No of girls = 420 - 240
= 180.
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