Hi! For question 4:
1 gallon = 8 pints, therefore 2 gallons = 16 pints.
10 members = 10 pints drank, which means 16-10=6 pints left (A).
For question 5:
PART A
1 step = 1 meter
1km = 1,000 meter, hence
5km = 5,000 steps.
PART B
1 step = 0.5 meters
1km = 2,000 steps, hence
5km = 10,000 steps.
Hope this helped you!