If you ignore the hard fact that you can not fill a gas tank 7/5 full and just use the fraction as given, the question is doable lol.. Not a logical or reaosnable question, but doable...
If I made something like that I would add a bonus question like:
1) "why is this question not a logical one"... This would actually help test kids if they truly understood fractions.
OR more simple
"Draw a picture of a gas tank filled to 7/5".. again it would get kids thinking..
OR a higher level question using 7/5 of a tank:
"I was going on a road trip that has no gas stations along the way... so I knew I had to bring more gas than my tank would hold.. MY tank holds 100 litres.. I knew I would need 7/5 of a tank of gas... In fraction form, how much of this fraction would go into the tank and how many litres would need to be stored in a jerry can?"... Kids would have to convert 7/5 to 1 and 2/5... so most kids would think they need to fill the Jerry can 2/5 full, but thats not true.. they would need to calculate what is 2/5's of 100litres and that would be the amount needed to be put into the jerry can..
AI can not make those type of extended thinking questions.. I've tried and it doesnt. I make them by hand