In a class of 250 students it was found that 140 took math 85 took psychology and 65 took both math and psychology how many students in the class took math or psychology?
N(math) + N(psych) - N(math AND psych) = N(math OR psych)
140+85-65 = N(math OR psych) = 160
(the 250 did not enter the picture unless you want to note that 90 took neither math nor psych )
To find the number of students in the class who took either math or psychology, we need to add the number of students who took math to the number of students who took psychology and then subtract the number of students who took both.
Let's calculate:
Number of students who took math = 140
Number of students who took psychology = 85
Number of students who took both math and psychology = 65
To find the number of students who took math or psychology, we add the number of students who took each subject and subtract the number of students who took both:
Number of students who took math or psychology = Number of students who took math + Number of students who took psychology - Number of students who took both
Number of students who took math or psychology = 140 + 85 - 65
Number of students who took math or psychology = 160
Therefore, there were 160 students in the class who took either math or psychology.