The ratio of number of boys and girls in a class is 3 : 2. In the 1st semester exam 30% of boys and 40% of girls get more than or equal to 80% marks. What percentage of students get less than 80% marks ?
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Answer:78%
Step-by-step explanation:
Let no. of boys = 3x
so , no. of girls= 2x
hence , total students = 5x
No. of boys who scored above 90% = 20/100×3x
=3x/5
No. of girls who scored above 90% = 25/100×2x
=x/2
total students who scored above 90%= 3x/5 + x/2
= 11x/10
now,
percentage of students who scored above 90% =(11x/10) ÷ (5x) × 100
= 22%
Hence %age of students who scored less than 90% = 100 - 22
= 78%
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