Answer:
The students who never want to travel to another country Y= 7S/10 -40
Step-by-step explanation:
Let's assume the number of students who have never been to another country be Y.
Then as per question 30% percent students have traveled out of the country.
Therefore 70% students out of S have never traveled to another country.
Equation becomes like Y= S×70÷100
Y = 7S/10
Now it is stated that 40 students of the students who have never been out of the country had eventually travel to another country.
Therefore the equation will be Y = 7S/10-40