Answer: The answers are given below.
Step-by-step explanation: The calculations are as follows:
(19) Weight of the puppy last week is

and weight of the puppy this week is

Therefore, the weight gained by the puppy is given by

(20) Time taken in Route 1 = 1 hour 30 minutes.
Time taken in Route 2 = 1 hour 45 minutes.
Time taken in Route 3 = 1 hour 35 minutes.
Time taken in Route 4 = 1 hour 25 minutes.
Since we want to spent the least amount of time on the bus, so we will be taking route 4.
(21) Time taken by Nazia to complete her language arts homework is

and the time taken by Nazia to complete her Mathematics homework is

Therefore, Nazia takes more time to complete Language Arts homework, by

(22) Quantity of Aluminium collected by Maya is

and the quantity of Aluminium collected by her friend Abigail is

Therefore,
(a) Abigail collected more aluminium
and
(b) Total Aluminium collected by both the girls is

(23) Quantity of snow fall last Wednesday is

and quantity of snowfall on sunday is

Therefore, quantity of snowfall was more on Sunday by

Thus, all the questions are answered.