Answer:
$20.
Explanation:
Given:
In the clip from the Simpsons, Ralph charges Bart twice the fair from Tucson to Flagstaff, minus 2/3 the fair from Albuquerque to El Paso.
It costs $40 to travel from Tucson to Flagstaff,
And $90 to travel from Albuquerque to El Paso.
Question asked:
How much does Bart need to pay ?
Solution:
Fair to travel from Tucson to Flagstaff = $40
Fair to travel from Albuquerque to El Paso = $90
As Ralph charges Bart twice the fair from Tucson to Flagstaff, minus 2/3 the fair from Albuquerque to El Paso.


Thus, Bart need to pay $20.