Answer: He will use 70 liters of gasoline on a trip of 700 kilometer.
Step-by-step explanation:
Given : Jessie uses 20 liters of gasoline to travel 200 kilometers.
We assume that the rate of consumption of gasoline is contant.
By UNITARY METHOD, the amount of gasoline required for 1 kilometer distance =
liter
Now, the amount of gasoline required for 700 kilometer distance =
liters
Hence, He will use 70 liters of gasoline on a trip of 700 kilometer.