28/7=4km is car journey covered by car in 1l
64/4=16l
Answer : 21
Hope this Helps :)
Answer:

Step-by-step explanation:
twice a number = 2n
the difference between 2n and 10 = 2n - 10
equals to 12 = 2n - 10 = 12
The answer is A.
if you need proof go to google and ask "is 2 irrational?"
.........................................................idk