adjective of colloquial is words used in conversation but not formal speeck and the adj quantity expresses an approximate amount rather than the exact number
It is given in the question that
The gas tank of Tyrell's truck holds 19.8 gallons. when the tank empty, Tyrrell fills it with gas that costs $3.65 per gallon.
It means cost of one gallon of gas is $3.65 .
And the tank hold 19.8 gallon . So cost of 19.8 gallon is

Therefore about $72.27 it will cost to fill the tank .
Pretty sure it’s 25 but I could be wrong. It’s also rly blurry. Hope this helps