There are 720 students in a school. The ratio of boys and girls in this school is 3:5. Find the total of girls & boys are there in this school?
Answers:  A) 320  B) 345  C) 450  D) 380  E) 400
In order to obtain a ratio of boys to girls equal to 3:5, the number of boys has to be written as 3 x and the number of girls as 5 x where x is a common factor to the number of girls and the number of boys. The total number of boys and girls is 720. Hence   3x + 5x = 720   Solve for x   8x = 720   x = 90   Number of boys   3x = 3 × 90 = 270   Number of girls   5x = 5 × 90 = 450   450
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There are 720 students in a school. The ratio of boys and girls in this school is 3:5. Find the total of girls & boys are there in this school?