Problem 1:
1 pint of water weighs = 1 pound
1 gallon has = 8 pints
So, 40 gallons have =

Hence, 40 gallons of water weighs 320 pounds.
Problem 2.
Height of Marcie = 0.97 meters
Height of Marcie's father = 1.84 meters
Her father is taller than =

So, Marcie's father is 0.87 meters taller than her.