Question

38. The ratio of boys and girls in a class is 5:3. 20% of
the boys and 60% of the girls have passed in first
class. What percentage of the class has passed in
first class?​

Answer 1

Answer:

35%

Step-by-step explanation:

Let the boys be 5x and girls be 3x

20/100 x $5x$ = $x$

60/100 x $3x$ = 9x/5

x + 9x/5 = 14x/5

14x/5 ÷ 8x × 100 = 14x/40x *100

= 35%

Answer 2

Answer:

let the number of boys and girls be 5x and 3x.

number of those who are passed in first class=20%of 5x+60%of3x

=(20/100*5x) +(60\100*3x)

=x+9x/5=14x/5

then, required percentage

=(14x/5*1/(5x+3x) *100) %

=14x/5*100/8x%

=35%