Answer:90
Step-by-step explanation:Hi.
Here is your answer---
Let the number of Students in a school be x.
Thus,Number of Girls = 3/7 of the total Students
= 3/7 of x
= 3x/7
We know,
Number of Boys + Number of Girls = Total Students.
64 + 3x/7 = x
64 = x - 3x/7
64 = (7x - 3x) /7 [Taking L.C.M.]
64 × 7 = 4x
x = 60 × 7
x = 420
Total number of Students in a school is 420.
Thus, Number of Girls = 3/7 × x
= 3/7 × 420
= 90
Thus, the number of Girls in a school is 90.
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Hope it helps.
Have a nice day.