In a class of 140 students, 80 students like math, 88 like science, 30 like both subjects. Find the number of students who like Either Math or Science.

Given: 

In a class of 140 students, 80 students like math, 88 like science, 30 like both subjects.

= (Students who like Math) + (Students who like Science) − (Students who like both)

= 80 + 88 − 30

= 138

138 students who like Either Math or Science.

Thus, correct option is (b).