The painting is 65in high by 105in wide.
We have to use a 1in=5in scale to make a scale drawing poster of a painting to sell at the gift shop
The dimensions of the poster will be as follows:
Height of the poster = 65/5 = 13 in
Width of the poster = 105/5 = 21 in
Therefore, the dimensions of your poster be 13in high and 21in width
Hope this helps ..!!
Thank you :)