The gas tank is 20% full. At $3 per gallon, find the cost to fill the tank. (1 gal = 231 in^3) The tank is 1.75 ft by 1.25 ft by 11 inches.

Guest Mar 19, 2020

#1**+2 **

This same question was already posted here: https://web2.0calc.com/questions/please-help_19950

Please look at this, instead of repeating a post.

Hope this helped!

CalTheGreat Mar 19, 2020

#2**+1 **

I will give you the steps but try to do the problem by yourself.

Start by finding the volume of the tank

Multiply 1.75 ft and 1.25 ft then covert the sum to inches by multiplying it by 12.

Then multiply that amount by the ll inches and you have the volume.

Since the tank is 20% full divide the volume by five, take the number you get from that and subtract it from the origanl volume.

Now you have the amount you need to fill.

Since it is 3$ a gallon and 231 cubed inches is a gallon 77 cubed inches is 1$.

Divide the amount you need to fill by 77 and you get the cost to fill the tank.

qwertyzz Mar 19, 2020

#3**+2 **

Multiply 1.75 ft and 1.25 ft then covert the sum to inches by multiplying it by 12.

.... you'll need to multiply by 12 x 12 = 144 sq in / sq foot not just multiply by 12 alone.... just a heads up FYI

ElectricPavlov
Mar 19, 2020

#4**+1 **

Volume of tank = (1.75 x 12 )in x (1.25 x 12) in x 11 in = 3465 in^{3}

3465~~ in^3~~ / ( 231~~ in~~ ^{3}~~/gal)~~ x $ 3 /~~gal ~~ = $ 45 to fill ENTIRE tank....but you only need 80% of this as tank is 20% full

80% x $45 = .8 * 45 = $ 36 to fill the already 20% full tank

ElectricPavlov Mar 20, 2020