Answer:
17.5
Explanation:
The truck started at 3/4 of a tank so you have to multiple 3/4 by 70 because 70 is the capacity of the tank
3/4 can be converted to .75 and them multiply it by 70
.75 * 70 = 52.5
now the truck used 1/3 of the gas which is 1/3 of 52.5
1/3 can be converted to .3333333333333333
.3333333333333333 * 52.5 = 17.5
so 17.5 is your answer