# Venn diagram trouble

Watch
#1
I need help on this one question is anyone smart enough

in a class of 20 students 11 people have a brother 9 people have a sister 6 people have neither

i need to put it into a diagram can anyone help me please
0
1 year ago
#2
ignore lol
Last edited by susu6679; 1 year ago
0
1 year ago
#3
(Original post by susu6679)
...most likely wrong but??
The overlap looks wrong. How about getting the OP to work it out for themselves?
1
1 year ago
#4
Thats wrong as you have a total of 23 children.
I set up 4 equations: X is the middle, a only brother, b only sister.
a X =11
b X =9
a b X =14 (20-6)
a b 2x=20
X=6
So 6 in the middle, 6 on the outside, 5 only brothers, 3 only sisters. let me know if I missed anything but we have a total of 20, 6 with none, 11 with brothers and 9 with sisters so all conditions are satisfied.
on mine and my plusses keep disappearing, hopefully our can work it out
Last edited by sdr981; 1 year ago
0
1 year ago
#5
(Original post by superduck6565)
I need help on this one question is anyone smart enough

in a class of 20 students 11 people have a brother 9 people have a sister 6 people have neither

i need to put it into a diagram can anyone help me please
Think about the fact that 6 people have neither so are outside the venn diagram.

That leaves 14 people inside it - 11 have a borther, 9 have a sister so there is some people who must have both (bit in the middle)
0
1 year ago
#6

Here's the diagram to clarify
0
1 month ago
#7
thx rlly helped
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

What I expected (106)
25.42%
Better than expected (87)
20.86%
Worse than expected (224)
53.72%