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Mathematics 15 Online
OpenStudy (anonymous):

MEDAL AND FAN!

jimthompson5910 (jim_thompson5910):

tell me what letters you have so far

OpenStudy (anonymous):

ok well for A i have 15

OpenStudy (anonymous):

For D i have 10

OpenStudy (anonymous):

And for letter I, I have 100

jimthompson5910 (jim_thompson5910):

so far so good

jimthompson5910 (jim_thompson5910):

what else?

OpenStudy (anonymous):

Oh wait nevermind D cant be 15 cuz at the end it says 40 ppl like hatchbacks

OpenStudy (anonymous):

Oh wait! B is 40 then right?

jimthompson5910 (jim_thompson5910):

you already said D = 10

jimthompson5910 (jim_thompson5910):

B isn't 40

OpenStudy (anonymous):

Oh so where does the 40 go if A is 15?

jimthompson5910 (jim_thompson5910):

`There are 40 people who liked hatchbacks` this goes in the "liked hatchbacks" row and "total" column. Basically saying "the total of people who liked hatchbacks is 40"

jimthompson5910 (jim_thompson5910):

ie, C = 40

OpenStudy (anonymous):

Oh so B is 25?

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (anonymous):

Because 40-15= 25

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

G=25... H=60....F=45

OpenStudy (anonymous):

right?

jimthompson5910 (jim_thompson5910):

G = 25 ... correct H = 60 ... not correct F = 45 ... not correct

jimthompson5910 (jim_thompson5910):

you may have mixed up H and F somehow?

jimthompson5910 (jim_thompson5910):

but the values don't swap (not entirely)

OpenStudy (anonymous):

No cuz 25+35= 60

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

I am confused now...

OpenStudy (anonymous):

I thought E was 35 and B was 25....35 + 25= 60?

jimthompson5910 (jim_thompson5910):

hint: G+H = 100

jimthompson5910 (jim_thompson5910):

another hint: C+F = 100

OpenStudy (anonymous):

Oh ok

OpenStudy (anonymous):

Ok so can we just review that.... A=15 B= 25 When we add those two we get C=40 D=10 E=??? What did we say E was? is it 50? when we add 50+10 we get F=100 G=25 H=i guess 75, if e is 50 25+75 is I=100

jimthompson5910 (jim_thompson5910):

F is not 100

OpenStudy (anonymous):

Oh i meant 60 sorry

jimthompson5910 (jim_thompson5910):

G+H = 100 25+H = 100 solve for H to get H = 75

jimthompson5910 (jim_thompson5910):

F = 60, correct

OpenStudy (anonymous):

cuz 50+10 is 60...

jimthompson5910 (jim_thompson5910):

or you can solve for F in C+F = 100 40+F = 100 either way, F = 60

OpenStudy (anonymous):

So would this be the chart?

jimthompson5910 (jim_thompson5910):

perfect

OpenStudy (anonymous):

Uh lol ok thank you now part B

OpenStudy (anonymous):

So the number would be 50, right? And then we divide that by 100. so 0.50 or 50% is that right?

jimthompson5910 (jim_thompson5910):

you have to consider the totals for those who don't like hatchbacks or sedans

jimthompson5910 (jim_thompson5910):

number who don't like sedans OR hatchbacks = (number who don't like sedans) + (number who don't like hatchbacks) - (number who don't like both)

OpenStudy (anonymous):

Oh so 75 or 75%

jimthompson5910 (jim_thompson5910):

close but no

OpenStudy (anonymous):

I thought it was the total?

OpenStudy (anonymous):

25% ?

jimthompson5910 (jim_thompson5910):

number who don't like sedans = 75 number who don't like hatchbacks = 60 number who don't like both = 50 number who don't like sedans OR hatchbacks = (number who don't like sedans) + (number who don't like hatchbacks) - (number who don't like both)

OpenStudy (anonymous):

Ohhh! okk so...

OpenStudy (anonymous):

85%

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (anonymous):

ok wow I finally understand this now?

jimthompson5910 (jim_thompson5910):

the subtle difference is that 50% would be if it said "what percentage didn't like BOTH types" or "what percentage didn't like sedans AND hatcbacks". They didn't just hate 1 car. They hate both cars.

OpenStudy (anonymous):

Ok i get it now.

jimthompson5910 (jim_thompson5910):

in part C, you simply compare the values of H and F

OpenStudy (anonymous):

so then it would be yes

jimthompson5910 (jim_thompson5910):

yes since H > F

OpenStudy (anonymous):

I cant thank you any more! I have one more question.. i am going to open it up in a few minutes

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