3x+7 = 51-x
4x = 44
x = 11
answer
x = 11
The given 3rd option is the viable answer.
You would look at number after the thousandths place to go up or down 72,000.
Given:
The scale of a map is
.
The distance between two buildings is 60 miles.
To find:
The distance between the given building on the map.
Solution:
We have,

It means, 80 miles in real life =
on the map.
1 mile in real life =
on the map.
60 mile in real life =
on the map.
=
on the map.
=
on the map.
Therefore, the buildings are
apart on the map.