So i NEVER thought i'd use high school algebra in real life but...
My car gets 28 miles to the gallon.
Gas costs about $3 per gallon.
If i am taking a trip that is 639 miles, how much money will i spend on gas?
Have worked out the "problem" to start:
28x=639
Anybody know?
2007-12-28 01:40:02 · 5 answers · asked by La vedette 6 in Education & Reference ➔ Homework Help
yes you did start off right. divide 639 by 28. you will get 22.8.
then you multiply 22.8 by $3. then you will get 68.46, as the an approximate amount of money you will spend on gas.
2007-12-28 01:46:04 · answer #1 · answered by Maddie Renee 2 · 1⤊ 0⤋
28x=639
28x/28=639/28
x= 22.82 gallons x 3= 68.46 for gas
2007-12-28 11:32:34 · answer #2 · answered by Dave aka Spider Monkey 7 · 1⤊ 0⤋
639/28 = number of gallons needed = ~23
cost = 23x3 = $69
that's it! :) Have a good trip!
2007-12-28 09:50:03 · answer #3 · answered by Marley K 7 · 1⤊ 0⤋
solve for x (which is the number of gallons of gas you will use), then multiply by 3 for the exact cost of gas (which is a little more than $68). However, that's not how much gas you will actually buy. When you buy gas, you generally fill up your tank. You wouldn't ever buy only enough gas to get you to your destination without any extra. The actual way to determine how much gas you will buy is determine the number of gallons of gas you need to get there, divide that number by the number of gallons of gas your tank holds, round up to the nearest half (if you need 1.1 tanks, call it 1.5), figure out how many gallons that is, and multiply the result by 3. That's a more realistic estimate on how much gas you will buy.
2007-12-28 12:16:12 · answer #4 · answered by punkkarrit182 3 · 1⤊ 0⤋
x = ( 639 / 28 ) * 3 = 68.46 (correct to two decimal places)
2007-12-28 10:49:35 · answer #5 · answered by hameerabbasi 3 · 1⤊ 0⤋