Irene's car has = 6 gallons of gas
Tank volume = 15 gallons
Gas cost = $3.80 per gallon
• Irene needs to add more than 1.5 gallons of gas to the car's gas tank.
If she wants to fill it at least halfway:
15/2 =7.5
7.5-6 = 1.5 gallons needed.
This statement applies.
• If Irene adds $3.80 worth of gas, her tank will be more than half full.
3.80 = 1 gallon
Add that gallon to the amount that the car already has:
6 +1 = 7 gallons
If the tank is half full: tank volume /2 = 15/2 =7.5 galloons
7<7.5
This statement does not apply.
• If Irene adds $7.60 worth of gas, her tank will be more than half full.
7.60/3.80 = 2 gallons
6+2 = 8 gallons
8> 7.5 (half full tank)
This statement applies.
• If Irene filled her tank, it would cost $34.20.
total volume- car's gas = 15-6 = 9 gallons (needed to fill the tank)
multiply the number of gallons needed by the cost per gallon.
9 x 3.80 = 34.2
$34.20 = $34.20
This statement applies