Mary bought 14 gallons of gasoline at $1.19 a gallon and 3 gallons of oil at $2.25 per gallon how much did she spend?
To find how much Mary spent, simply multiply the total cost per gallon with the total amount of gallons spent.
Let's start off with: Mary bought 14 gallons of gasoline at $1.19 a gallon
Gallons bought x price per gallon = total amount of money spent on the gallons
14 (gallons) x $1.19 (per gallon) = $16.66 (total cost of 14 gallons)
Next step, Mary buys 3 gallons of oil at $2.25 per gallon, we do the exact same steps above.
Gallons bought x price per gallon = total amount of money spent on the gallons
3 (gallons) x $2.25 (per gallon) = $6.75 (total cost of 3 gallons)
Now, be sure to remember those 2 number (I've bolded it for you so you could see how to get it and where it is if you need to go back and look at the problem)
Now, we want to find the total amount in dollars Mary had spent on gasoline. Simply add the two total cost of gallons (14 gallons + 3 gallons solution)
Remember the bolded parts? Those come in handy right about now: simply add them together.
$16.66 (total cost of 14 gallons) + $6.75 (total cost of 3 gallons) = $23.41 (total amount of money Mary spent on gasoline)
