Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Simple Math Problem - It's been a while...
#1
What's the proper way to solve this problem?

Quote:If a car uses 1 1/2 gallons of gas every 30 miles, how many miles can be driven with 6 gallons of gas?
Reply
#2
divide
6 gal/1.5 gal=4 gal

multiply
4 gal x 30 miles=120 miles
CLEP
Natural Sciences -Social Sciences -US History I -Intro Psychology -Human Growth and Development -Humanities -A&I Lit -College Math
DSST
Organizational Behavior -Human Resources Management -Ethics in America -Business Ethics and Society -Technical Writing -Substance Abuse
ECE
Organizational Behavior -Human Resources Management -Labor Relations -Psychology of Adulthood and Aging -Abnormal Psychology -Social Psychology -Foundations of Gerontology-Research Methods in Psychology-Contemporary Mathematics
Kaplan
Prior Learning Assessment
Reply
#3
Alram is correct. Another way to think about it:
If the car goes 30 miles in 1.5 hours, you can double both those numbers to get 60 miles in 3 hours. Then double again to get 120 miles in 6 hours.
BA, MA, EdS, MMT, etc.
83 hours of ACE-worthy credits
Reply
#4
alram Wrote:divide
6 gal/1.5 gal=4 gal

multiply
4 gal x 30 miles=120 miles

Thanks!

KayV Wrote:Alram is correct. Another way to think about it:
If the car goes 30 miles in 1.5 hours, you can double both those numbers to get 60 miles in 3 hours. Then double again to get 120 miles in 6 hours.

You guys are awesome! The qualifying test that I'm studying for will be timed and little "tricks" like this will help!

If you don't mind, I have another basic algebra question:

Quote:An airplane flying a distance of 875 miles used 70 gallons of gasoline. How many gallons will it need to travel 3000 miles?


I believe it's something like this, but I can't remember how to manipulate it into a solvable equation:

875/70 = 3000/x

Can you run me through this step-by-step?
Reply
#5
cross multiply

just keep your units the same (gallons, miles, grams, light years,
keep them the same and it all works out

Code:
(1.5/30) = (6/x)

1.5 gallons        6 gallons
------------  =   ----------
30 miles           x miles

1.5 * x = 30 * 6

1.5 * x = 180

x = 180/1.5

x = 120
Reply
#6
bluebooger Wrote:cross multiply

just keep your units the same (gallons, miles, grams, light years,
keep them the same and it all works out

Code:
(1.5/30) = (6/x)

1.5 gallons        6 gallons
------------  =   ----------
30 miles           x miles

1.5 * x = 30 * 6

1.5 * x = 180

x = 180/1.5

x = 120

You can do the same for your last question

cross multiply and divide

875 whatnot 3000 whatnot
------ = ------
70 thingies x thingies

3000 X 70 = 210,000

210,000 divided by 875 = 240

X = 240
Linda

Start by doing what is necessary: then do the possible; and suddenly you are doing the impossible  St Francis of Assisi

Now a retired substitute Teacher in NY, & SC

AA Liberal Studies TESC '08
BA in Natural Science/Mathematics TESC Sept '10
AAS Environmental safety and Security Technology TESC  Dec '12
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
Question The hardest kind of math is... LevelUP 5 857 04-29-2023, 12:44 AM
Last Post: bjcheung77
  All you math geniuses categ 5 6,607 09-27-2020, 01:40 PM
Last Post: Thorne
  Math Help Giantzebra 22 4,987 07-09-2019, 02:43 PM
Last Post: Giantzebra
  Help with Balance Sheet Problem craigfin 2 2,262 04-11-2016, 04:22 PM
Last Post: craigfin
  Are there two right answers for this problem? bassinbros 2 2,391 11-07-2014, 10:51 AM
Last Post: cookderosa
  Work Word Problem NJGx03x871 4 2,299 07-16-2014, 10:09 PM
Last Post: NJGx03x871
  Marketing Problem Drummerboy 7 3,655 08-23-2007, 10:15 AM
Last Post: Drummerboy

Forum Jump:


Users browsing this thread: 1 Guest(s)