In a class, 10% of the girls have blue eyes, and 20% of the boys have blue eyes.
If the ratio of girls to boys in the class is 3:4, then what is the fraction of students in the class having blues eyes?
the answer is 11/70, however the solution given is;
let 1 represent the total # of students
1-(.1+.2)= .7 ( why is this done???
why isnt it .1+.2=.3 as the denominator)
girls(with blue eyes) + boys(with blue eyes) =
(3*.1 )+(4*.2)/ .7 = .3+.8/.7= .11/.7 = 11/70
why is .7 the denominator and not .3.
isnt .3 the total percentage of students with blue eyes?
If the ratio of girls to boys in the class is 3:4, then what is the fraction of students in the class having blues eyes?
the answer is 11/70, however the solution given is;
let 1 represent the total # of students
1-(.1+.2)= .7 ( why is this done???
why isnt it .1+.2=.3 as the denominator)girls(with blue eyes) + boys(with blue eyes) =
(3*.1 )+(4*.2)/ .7 = .3+.8/.7= .11/.7 = 11/70
why is .7 the denominator and not .3.
isnt .3 the total percentage of students with blue eyes?
