The average marks of boys in a class is 52 and that of girls is 42 . The average marks of boys and girls combined is 50 . The percentage of body in the class is a.60 b.40 c.20 d.80
Answers 2
Correct option is D)
Let the number of boys and girls be x and y
According to the question,
⇒ 52x + 42y = 50(x+y)
⇒ 52x + 42y = 50x + 50y
⇒ 52x − 50x = 50y − 42y
⇒ 2x = 8y
∴ x = 4y ------ ( 1 )
Total number of students in the class
= x + y
= 4y + y
[ From (1) ]
= 5y
Percentage of boys =5y / 4y × 100
= 80%
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Author:
alirubio
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Answer:
option D 80 percent is the correct
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Author:
velascoxc8x
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