Equal to the area. Area of circle is
This equals to
due to 2^2.
Circumference is
This equals to
When you multiply the 2 and the radius together, they equal to 2^2.
Which results to
7 and 1/2 mile because 2,640=1.5 miles
4-1.5=2.5+5=7.5
We are given that there are a total of 78 students. If we set the following variables:
Then, the sum of all of these must be 78, that is:
Since there are 15 in chemistry and physics and 47 in chemistry, we may replace that into the equation and we get:
Simplifying:
Now we solve for P by subtracting 62 on both sides:
Therefore, there are 16 students in physics