The number of students who enrolled in business mathematics alone can be calculated by subtracting the number of students enrolled in both from the total number of students enrolled for business mathematics.
x = 600 - 173 = 427
In similar manner, we solve for the number of students enrolled for only statistics
y = 300 - 173 = 127
The total number of students enrolled in two courses altogether is the sum of x and y and 173.
T = 427 + 127 + 173 = 727
Thus, all in all there are 727 students enrolled in the two courses.
first I just added all similar numbers together, then I added the answers of all the similar numbers together one-by-one, finally we find our answer, 90
