Question
The ratio of number of boys to number of girls of a
class was 2:5. If 4 girls were absent, the ratio becomes 3:7. Find total number of students in the class.Solution
Let the number of boys and girls in the class be 2a and 5a respectively.2a/(5a - 4) = 3/714a = 15a - 12a = 12Therefore, total number of students in the class = (2 + 5)*12 = 84
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