In a school hall, the ratio of the number of teachers to the number of girls is 5: 12 whereas the ratio of the number of girls to the number of boys is 12:13. 25% of the girls participate in a dance competition. If there are 18girls left to participate in competitions other than dance, find the total number of people present in the hall.
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Answer:
Boys : Girls = 5x : 2x
According to the question
5x - 2x = 450
3x = 450 = x =150
∴∴ Number of students in that school
= 5x + 2x = 7x
7 x 150 = 1050
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