MsBrains (ms-brains):
Can somebody help check 12 of my practice questions? I need to make sure they are correct to prepare for class. I will fan and medal
MsBrains (ms-brains):
#8 I don't know how to solve these kind of problems, So my best guess is A.
Vocaloid (vocaloid):
well, first we pick an arbitrary number x then, we know that the ratio of 5x to 3x is 5 to 3, with me so far?
MsBrains (ms-brains):
Yeah
Vocaloid (vocaloid):
good, and the sum is 16 so 5x + 3x = 16 solve for x
MsBrains (ms-brains):
x=2?
Vocaloid (vocaloid):
good. now we work backwards and find 5x and 3x
MsBrains (ms-brains):
You lost me there, how do we work backwards?
Vocaloid (vocaloid):
well we just found out that x = 2 so what are 5x and 3x equal to?
MsBrains (ms-brains):
10 and 6?
Vocaloid (vocaloid):
yup so 10 and 6 are our answers
MsBrains (ms-brains):
Awesome, thanks so much! You are really helping me learn a bunch
Vocaloid (vocaloid):
uh you just posted the same question
MsBrains (ms-brains):
Oh! sorry give me second xD
OpenStudy (benlindquist):
lol
MsBrains (ms-brains):
#9. A?
OpenStudy (benlindquist):
Looks right, ?
Vocaloid (vocaloid):
hm not quite
OpenStudy (benlindquist):
do you add? divide?
Vocaloid (vocaloid):
find: 100*(new height-old height)/(old height)
MsBrains (ms-brains):
100*120/15 = 800
Vocaloid (vocaloid):
nope
Vocaloid (vocaloid):
new height - old height = ?
MsBrains (ms-brains):
Wait, so its not 100*120/15? It is 100*120-15?
Vocaloid (vocaloid):
neither
Vocaloid (vocaloid):
100*(new height-old height)/(old height) = 100*(120-15)/15 = ?
MsBrains (ms-brains):
100*(120-15)/15 = 700%
Vocaloid (vocaloid):
yes! [if you're wondering why we subtract new height - old height, it's asking for the INCREASE, so we need to know how much the height increased by first]
Vocaloid (vocaloid):
[this concept actually confuses a lot of people. "percent increase" is different than "percent of"]
MsBrains (ms-brains):
B?
Vocaloid (vocaloid):
not quite well, remember how we went from 3.1 to 310% by multiplying by 100? in this situation we're doing the opposite, so we divide by 100
MsBrains (ms-brains):
So A then? 0.0001
Vocaloid (vocaloid):
yup
MsBrains (ms-brains):
C?
Vocaloid (vocaloid):
nope (remember that "percent" means per 100, not 200 just divide 20/200
MsBrains (ms-brains):
So it;s 20%?
Vocaloid (vocaloid):
no, it's not 20%
Vocaloid (vocaloid):
what is 20 divided by 200?
MsBrains (ms-brains):
10%
Vocaloid (vocaloid):
good
MsBrains (ms-brains):
Last one. My best guess on this is A. I Don't know how to solve it. ;-;
Vocaloid (vocaloid):
simple interest means he earns 4% of 5500 each year so, first find 4% of 5500
MsBrains (ms-brains):
220%
Vocaloid (vocaloid):
just 220, no percent sign now multiply that by 5
MsBrains (ms-brains):
1100
MsBrains (ms-brains):
So it was A xD
MsBrains (ms-brains):
Right? o.O
Vocaloid (vocaloid):
yeah I didn't really look at the answer choices beforehand :P
MsBrains (ms-brains):
Thanks so much for the help. :)
MsBrains (ms-brains):
We're all done. :)
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