in a class of 50 students the average age of girls is 12 3 yrs and boys is 12 3

Now let no of boys be b and no of girls be g.
Then (1) total 50 students => b + g = 50.

(2) 12.5b + 12.3g = 12.4*50.

After solving above two equations we get b =25 and g = 25..
10 years agoHelpfull: Yes(6) No(2)
Pl. read in my earlier solution as
(12.3b+12.5b)/50=12.4 ---(ii)
10 years agoHelpfull: Yes(3) No(0)
Its a simple alligations concept, by solving you get the ratio of boys & girls as 1:1 & hence the total no of boys is 25 & girls is 25.
10 years agoHelpfull: Yes(1) No(1)
Ans: 25 boys and 25 girls
Sol:let No of girl is X and boy(50-X)
((X*12.3)+(50-X))/50=12.4
after Solving equation, we get
X=25
9 years agoHelpfull: Yes(1) No(0)
let x be no. of girls
so no. of boys is 50 - x

equation becomes
12.3 * x + 12.5 * (50 - x) = 50 *12.4
makes x = 25
so no of girls and boys are 25 and 25 respectively
5 years agoHelpfull: Yes(0) No(0)

in a class of 50 students the average age of girls is 12.3 yrs and boys is 12.3 yrs and that of boys is 12.5 yrs . if the average of the class is 12.4 yrs , then the number of boys and girls in the class are ?