Question

.-.

Answer 1

should i put the second equation as

0.45x + 0.1y = 10.35??

Answer 2

@phi ? do you know this?

Answer 3

I assume the 1st solution is 55% bromine and 45% water
the 2nd sol is 10% bromine and 90% water

Answer 4

so...the second equation is 0.55x + 0.1y = 10.35?

Answer 5

Let's just track the water

call 1st solution x and the 2nd y
x+y= 30
amount of water is
0.45x + 0.9y = 0.345*30

Answer 6

don't give me the answerrrr

Answer 7

oh D:

Answer 8

erase ittttt pl0x

Answer 9

so tempted to looooook

Answer 10

ok, thanks :)

Answer 11

I'll write it in a simple way

Answer 12

so...the second equation is 0.55x + 0.1y = 10.35?

I think you are mixing up the water with the bromine here

Answer 13

urgh

Answer 14

45x + .10(30 - x) = .345 * 30
45x + 300 - 10x = 1035
35x = 735
x = 21

Answer 15

I interpret 34.5% water/ bromine to mean 34.5% water and 65.5% bromine

Answer 16

oh ok

Answer 17

lol stahp ineed

Answer 18

D: I must help to get my score up

Answer 19

Don't look at the chat

Answer 20

ok.

x + y = 30
0.45x + 0.9y = 10,35?

Answer 21

10.35*

Answer 22

Yes sir

Answer 23

phiiiiiiiiii

Answer 24

are you sure?

Answer 25

and i'm a girl :)

Answer 26

Mhmmm I am and im a boy

Answer 27

and boys are way smarter then girls (: lol im just kidding

Answer 28

I GET A NEGATIVE NUMBER. we did something wrong :l

Answer 29

Liters of 45% water solution—x:
0.55x + 0.1(30 - x) = 0.345(30)
0.55x + 3 - 0.1x = 10.35
0.45x = 7.35
x = 735/45 or 147/9 or 16 1/3

Liters of 10% bromine solution:
= 30 - 147/9
= (270 - 147)/9
= 123/9 or 41/3 or 13 2/3?

Answer 30

IF YOU DON'T WANT TO KNOW THE ANSWER DON'T READ ANY FURTHER


Answer: 45% water solution, 16 1/3 liters; 10% bromine solution, 13 2/3 liters

Answer 31

x + y = 30
0.45x + 0.9y = 10.35

x = 30 - y

0.45(30 - y) + 0.9y = 10.35
13.5 - 0.45y + 0.9y = 10.36
13.5 + 0.45y = 10.35
0.45y = -3.15
y = -7...

Answer 32

Hmmm -7 I don't get that

Answer 33

If we really start with 45% water and 90% water, we can never get lower than 45% or higher than 90% water

Is there a typo in the original question?

Answer 34

no there isn't. i copy/pasted directly

Answer 35

then how'd i get -7?? what did i do wrong?

Answer 36

please help.

Answer 37

If we assume the question meant 10% water in the 2nd solution you can solve
0.45x + 0.10y = 0.345*30

If that gives the answer in the book, I think you are a victim of a typo

Answer 38

it doesn't give me an answer

Answer 39

see, that's exactly what it says?

Answer 40

I would send a note to the teacher about this problem, and ask for extra credit for finding a bogus question.

Answer 41

send your teacher an emaill

Answer 42

the only other way to interpret it so it makes sense is that 34.5% water/bromine means the solution is 34.5% bromine and 65.5% water. Could that be what they mean?

Answer 43

even if it is 34.5%, i'd still get -7? that's how i worked the problem

Answer 44

that would give
0.45x + 0.9y = 0.655*30

Answer 45

oh wait. sorry lol. misread

Answer 46

but it says water/bromine

Answer 47

Yes it does say water/bromine but interpreting that to mean 34.5% water leads to no solution... It is possible they mean 34.5% bromine... and at least this will give a result.

Answer 48

:/ ok. lemme work this one out then

Answer 49

Well I am confused at this point just try to do it If I come up with an idea I'll reply

Answer 50

y = 13.67?

Answer 51

x = 16.33?

Answer 52

yes

Answer 53

ok, thanks! on to the next one!

Answer 54

Q4 makes sense. notice that the cost per foot that they want is in between the cost of maple and the cost of pine.

Answer 55

wait, wait. i haven't tried it yet

Answer 56

You can expect the answer to be mostly maple

Answer 57

y = 3
x = 9?

Answer 58

sorry it took so long :/ debate in the chat

Answer 59

is that right? @phi

Answer 60

yes

Answer 61

:) ok thanks

Answer 62

apparently it's supposed to say 10% water, not 10% bromine. i'm mad. i'll tell him.

Answer 63

You could have been more proactive and put in a note concerning the question, pointing out the problem. On the bright side, you seem able to do these problems.

Answer 64

i just resubmitted with it being 10% water (x = 21, y = 9), and i told him in the comment box that there was a typo on the question