Amit drives a pickup truck. on monday, his gas tank was 1/2 full, and he filled it up. on thursday his gas tank was 3/4 full, and he again filled it up. amit put a total of 19 1/2 gallons of gas into his truck. what is the capacity of the trucks fuel tank?

Why can't my rank go i have 1723 points, but my rank is only at ambitious, which is only 250 points! like, (p.s. i know this isn't related to math, but i just don't know why it's doing this and i would really appreciate if someone could tell me whats going on with this)