Question 21.
In a class, 60% of the students are girls and the rest are boys. There are 30 more girls than boys. If 68% of the students, including 30 boys, pass an examination, the percentage of the girls who do not pass is
A
B
C
D
Question Explanation
Text ExplanationVideo Explanation
Assuming the number of students =100x
Hence, the number of girls = 60x and the number of boys = 40x
We have, 60x-40x=30 => x=1.5
The number of girls = 60*1.5=90
Number of girls that pass = 68x-30=68*1.5-30 = 102-30=72
The number of girls who do not pass = 90-72=18
Hence the percentage of girls who do not pass = 1800/90=20
No video explanation yet — we're on it and uploading soon!
