Answer:
Here, the given problem,
The total number of hours =
Now, the number of hours to make each invitation card =
Hence, the total number of invitations =
a. Scale the number line from 0 to 1,
In which each unit represents
By the number line,
b. By model,
Take a grid which shows 1 hour and each box of the grid represents 1/12th hour,
By the grid,
That is, the number of hours to make invitation = 9
c.