Answer:
25 percent
Step-by-step explanation:
Let the number of girls be x. Then the number of boys is 3*x = 3x.
the total number of students , i.e. 100 percent the number of students is therefore x + 3x = 4x.
so we have
4x = 100 percent
x = 100/4 percent
= 25 percent
therefore, the percentage of girls is 25
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