Question : In a parade of school students, the number of boys and girls are in the ratio of 9 : 7, respectively and the number of students is 256. Find the number of girls:
Option 1: 102
Option 2: 112
Option 3: 118
Option 4: 128
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Correct Answer: 112
Solution :
Given: Ratio of number of boys and girls = 9 : 7
Total number of students = 256
Let the number of boys and girls in a parade of school be 9x and 7x, respectively.
So, the total number of students = 9x + 7x = 16x
According to the question,
16x = 256
$\therefore$ x = 16
Number of girls = 7x = 7 × 16 = 112
Hence, the correct answer is 112.
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