Question

The gasoline gauge on a van initially read one third

Answer 1

3/4 - 1/3 = 9/12 - 4/12 = 5/12

(5/12) / 10 = 1 / x
5/12x = 10
x = 10* 12/5
x = 120/5 = 24 gallons...so when full, the tank holds 24 gallons

so if it is already 3/4 full, then u just need 1/4 to fill
1/4(24) = 24/4 = 6......so u would need 6 more gallons to fill the tank up to full capacity.