X : the gas used by first car in 1 particular week
y : the gas used by second car in 1 particular week

With cross multiplication you can find that they are the same. In both equations, x would be 100.
Answer:
the tip will be 1.40 which will make your bill total 15.40 hope this helps
Step-by-step explanation:
False. 1/3 of 31 is about 10, so 55 is bigger than 10