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1. The Percentage of female students in the school trip is 39%.

   According to the statement

   we have given that the some ratio of the class students and teachers and we have to find the percentage of female students on the school trip.

   So, For this purpose,

   The Given information is:

   The ratio of the number of teachers to the number of students is 1:15.

   and the ratio of the number of male and female students is 7:5

   Suppose the number of teachers is x. So, students become 15x

   For the ratio of male to female, assume male is 7y, so female is 5y

   The sum of the male and female students comprises the whole student community is:

   15x = 7y + 5y

   15x = 12y

   5x = 4y

   then

   The percentage of female students on the trip is calculated by use the below written formula. So,

   Percentage of female students = (5y / x +15x) * 100

   Percentage of female students = (5y /16x) * 100

   Substitute the value of y which is y = 5/4x

   So,

   Percentage of female students = (5*5/4x / 16x) * 100

   Percentage of female students = 625/16

   Percentage of female students = 39%.

   So, The Percentage of female students in the school trip is 39%.

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