Armando read 20 pages of his 200-page book in 4 hours. At this rate, how long will it take him to read the entire book?
20 hours
40 hours
4 hours
5 hours
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OpenStudy (alexalas):
so 20/4=?
OpenStudy (flvs.net):
5
OpenStudy (alexalas):
so that is 5 pages per hour correct?
OpenStudy (flvs.net):
Awesome!! can you help me with more please?
OpenStudy (alexalas):
sure
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OpenStudy (flvs.net):
Marisa painted one-half of her bedroom in three-fourths of an hour. At this rate, how long would it take her the paint the entire room?
three-eighths of an hour
eight-thirds of an hour
four-sixths of an hour
six-fourths of an hour
OpenStudy (alexalas):
3/4 +3/4=?
OpenStudy (flvs.net):
1.5
OpenStudy (alexalas):
yes but keep it in fraction form
OpenStudy (flvs.net):
how do i convert it??
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OpenStudy (anonymous):
Quick question what did you get for the first question you asked?
OpenStudy (flvs.net):
5
OpenStudy (alexalas):
yes but keep it in fraction form
OpenStudy (anonymous):
5 hours?
OpenStudy (flvs.net):
yea
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OpenStudy (anonymous):
thats wrong
OpenStudy (alexalas):
5 pages for 1 hour
OpenStudy (flvs.net):
how do i convert it into a fraction?
OpenStudy (flvs.net):
how is it wrong? @Emma_1997
OpenStudy (alexalas):
1.5 to fraction
put a 1 under it so 1.5/1
then multiply by 4 so (1.5*4)/(1*4)=6/4
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OpenStudy (alexalas):
not five hours for one page but 5 pages for one hour
OpenStudy (flvs.net):
so it's 6/4? but wait it's improper sooo...
OpenStudy (alexalas):
the answer is 6/4. in word form that is (six-fourths) and that is the answer
OpenStudy (anonymous):
the first question is wrong because \[20 * 10 = 200 \]
so you would do \[4 * 10 =?\] to get your answer for how many hours it would take her to read the entire book
OpenStudy (flvs.net):
okay thank you, i have two more can you help?
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OpenStudy (flvs.net):
so 40 pages
OpenStudy (anonymous):
yess
OpenStudy (alexalas):
no it takes 40 hours
OpenStudy (anonymous):
no 40 hours
OpenStudy (flvs.net):
that's what i meant and THANK YOU GUYS, can you help me with more>
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OpenStudy (alexalas):
oh I am sorry i mislead you 5/1 is the ratio for pages/hours so 5/1=x/200 you cross multiply and you get 40 hours per 200 pages
OpenStudy (flvs.net):
it's fine
but ii have two more.
OpenStudy (alexalas):
lets see the first one
OpenStudy (flvs.net):
Margie calculated that she would spend $175 on school supplies this year. She actually spent $97.50 on school supplies. What is Margie’s percent of error?
77.3%
79.5%
44.2%
4.4%
OpenStudy (alexalas):
umm i am a little rusty with this one give me a few minutes
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OpenStudy (flvs.net):
okay, hbu @Emma_1997
OpenStudy (anonymous):
give me a second im a little rusty too
OpenStudy (flvs.net):
okay, i suck at 7th grade math
OpenStudy (alexalas):
alright 97.50-175=?
OpenStudy (flvs.net):
-77.5
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move the decimal over 2 places to make percentage
so .442=44.2%
OpenStudy (flvs.net):
thank you!! >_< last one
Maxine spent 15 hours doing her homework last week. This week she spent 18 hours doing homework. She says that she spent 120% more time doing homework this week. Is she correct? Show your work to justify your decision.
OpenStudy (alexalas):
change 120% to decimal form
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OpenStudy (alexalas):
or divide 18 by 15
OpenStudy (flvs.net):
1.2
OpenStudy (alexalas):
so 15*1.2=?
OpenStudy (flvs.net):
18
OpenStudy (alexalas):
so is 120% of 15 18?
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OpenStudy (flvs.net):
yes?
OpenStudy (alexalas):
alright there are two ways of doing this one
18/15=1.2=120% or
120%=1.2, 1.2*15=18
using either way yields the correct answer it depends on what is easier.
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OpenStudy (flvs.net):
Margie calculated that she would spend $175 on school supplies this year. She actually spent $97.50 on school supplies. What is Margie’s percent of error?
77.3%
79.5%
44.2%
4.4%
this one
OpenStudy (alexalas):
was it not 44.2%
OpenStudy (flvs.net):
no
OpenStudy (alexalas):
what was the answer?
OpenStudy (flvs.net):
idk
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