Question

A full tank that holds 11.6 gallons of gas is using 1.45 gallons per hour. Is the tank more than half full of gas after 3.5 hours? Explain your answer.

Answer 1

Since it is using 1.45 gallons per hour, then after 3.5 hours it will use:

`1.45*3.5`

gallons of gas.

Now, notice that:

`1.45*3.5=5.075.`

Also, we know that:

`5.075<5.8=(11.6)/(2)\text{.}`

Therefore it will use less than half of the full tank, then the tank is more than half full of gas after 3.5 hours.

Answer: Yes, because in 3.5 hours it uses less than half of the full tank.