 Simple Math Problem - It's been a while... - Printable Version +- Online Degrees and CLEP and DSST Exam Prep Discussion (https://www.degreeforum.net/mybb) +-- Forum: Main Category (https://www.degreeforum.net/mybb/Forum-Main-Category) +--- Forum: Off Topic (https://www.degreeforum.net/mybb/Forum-Off-Topic) +---- Forum: What does this Flashcard mean or Do this math problem for me (https://www.degreeforum.net/mybb/Forum-What-does-this-Flashcard-mean-or-Do-this-math-problem-for-me) +---- Thread: Simple Math Problem - It's been a while... (/Thread-Simple-Math-Problem-It-s-been-a-while) Simple Math Problem - It's been a while... - NJGx03x871 - 06-29-2014 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? Simple Math Problem - It's been a while... - alram - 06-29-2014 divide 6 gal/1.5 gal=4 gal multiply 4 gal x 30 miles=120 miles Simple Math Problem - It's been a while... - KayV - 06-29-2014 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. Simple Math Problem - It's been a while... - NJGx03x871 - 06-29-2014 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? Simple Math Problem - It's been a while... - bluebooger - 06-29-2014 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``` Simple Math Problem - It's been a while... - Lindagerr - 06-29-2014 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