Answer:
5 inches: 2 feet
Explanation:
Since Omar's 42 feet long deck is 105 in. on his drawing and we know his scale is 5 in. for every x feet, we can determine how much feet is equivalent to 5 in. on his scale using a proportion:
42 ft / 105 in. = x ft / 5 in.
42/105 = x/5
(2/5 = x/5) * 5
10/5 = x
2 = x
Thus, 5 inches represents 2 feet on Omar's scale.