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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?
good, and the sum is 16 so 5x + 3x = 16 solve for x
good. now we work backwards and find 5x and 3x
You lost me there, how do we work backwards?
well we just found out that x = 2 so what are 5x and 3x equal to?
10 and 6?
yup so 10 and 6 are our answers
Awesome, thanks so much! You are really helping me learn a bunch
uh you just posted the same question
Oh! sorry give me second xD
Looks right, ?
hm not quite
do you add? divide?
find: 100*(new height-old height)/(old height)
100*120/15 = 800
new height - old height = ?
Wait, so its not 100*120/15? It is 100*120-15?
100*(new height-old height)/(old height) = 100*(120-15)/15 = ?
100*(120-15)/15 = 700%
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]
[this concept actually confuses a lot of people. "percent increase" is different than "percent of"]
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
So A then? 0.0001
nope (remember that "percent" means per 100, not 200 just divide 20/200
So it;s 20%?
no, it's not 20%
what is 20 divided by 200?
simple interest means he earns 4% of 5500 each year so, first find 4% of 5500
just 220, no percent sign now multiply that by 5
So it was A xD
yeah I didn't really look at the answer choices beforehand :P
Thanks so much for the help. :)
We're all done. :)