Proportion Word Problems | MathHelp.com - By MathHelp.com
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| 00:0-1 | If a car gets 20 miles to the Gallon , | |
| 00:03 | how many gallons of gas will it use to travel | |
| 00:06 | 180 miles To solve this problem , Our first step | |
| 00:12 | is to write down the unit ratio that is involved | |
| 00:16 | . In this case it's miles traveled over gallons of | |
| 00:26 | gas . Mhm . Next we set up a proportion | |
| 00:37 | based on the information in the problem , We know | |
| 00:41 | that a car gets 20 miles for every one gallon | |
| 00:46 | , So we have 20/1 And were asked how many | |
| 00:51 | gallons of gas that will use to travel 180 miles | |
| 00:56 | . So that's 180 over X . Notice that the | |
| 01:02 | 180 miles must go on top in the second ratio | |
| 01:07 | because our unit ratio tells us that we put miles | |
| 01:11 | over gallons solving . From here . We use the | |
| 01:15 | means extremes property To get 20 times x or 20 | |
| 01:21 | x Equals one times 180 or 180 And dividing both | |
| 01:29 | sides by 20 X equals nine . So the car | |
| 01:39 | will use nine gallons of gas to travel 180 miles | |
| 01:46 | . Yeah , yeah . |
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