Two thirds of all students at school are girls.
Two thirds of all students have dark hair.
If half the boys have dark hair, then what portion of the girls have black hair?
Express your answer as a common fraction Two thirds of all students at school are girls.
Two thirds of all students have dark hair.
If half the boys have dark hair, then what portion of the girls have black hair?
Express your answer as a common fraction @Mathematics

Question

Two thirds of all students at school are girls. 
Two thirds of all students have dark hair.
If half the boys have dark hair, then what portion of the girls have black hair?
Express your answer as a common fraction Two thirds of all students at school are girls. 
Two thirds of all students have dark hair.
If half the boys have dark hair, then what portion of the girls have black hair?
Express your answer as a common fraction @Mathematics

anonymous · Answer

1/2

asnaseer · Answer

call total number of students T.
the girls = 2T/3, boys=T/3
dark haired = 2T/3
half boys have dark hair, so (1/2)*(number of boys)=(1/2)*(T/3)=T/6
but total students with dark hair is 2T/3, so remaining dark haired students (all girls) must be = (2T/3)-(T/6)=3T/6=T/2
total girls is 2T/3, so portion of girls that have dark hair = (1/2) / (2/3) = (1/2) * (3/2) = 3/4
so 3/4 of girls have dark hair

anonymous · Answer

what portion of the girls have black hair?
that was the question what portion of girls have dark hair i said 1/2 portion of girls have dark hair

anonymous · Answer

sheg has it.  imagine 6 students, 3 with dark hair, consisting of 4 girls, 2 boys. 1 boy has dark hair and therefore 2 girls (half the number of girls) have dark hair.

anonymous · Answer

so the answer is 1/2

anonymous · Answer

yes and hint for future questions: since the total was not given in the problem, it makes no difference what the total it.  therefore feel free to make up simple numbers to work with.  whatever answer you get ( if you do it right) will be correct.

asnaseer · Answer

satellite73 - if you use 6 as the total number of students then number with dark hair should be 4 (2/3 of 6)

anonymous · Answer

oh so i did. i  thought it said "half the students have dark hair"

anonymous · Answer

satelite asnaseer is right we have taken total remaining students with dark hairs here

anonymous · Answer

you are correct and i am wrong. should be 4 with dark hair, therefore 1 by and 3 girls.

anonymous · Answer

*boy

anonymous · Answer

can someone answer my domino question i cant figure that out

anonymous · Answer

therefore 3 out of 4 girls have dark hair, and the answer is 3/4