Answer: There are 16 vans and 36 buses and Option 'c' is correct.
Step-by-step explanation:
Since we have given that
For high school A,
Number of vans = 5
Number of buses = 3
Number of students = 188
For high school B,
Number of vans = 10
Number of buses = 5
Number of students = 340
So, Let the number of students in van be 'x'
Let the number of students in bus be 'y'.
According to question, it becomes;

So, first we do:
2(5x+3y=188)
10x+6y=376----------------(3)
So, from (2) and (3), we get that

so, put the value of y = 36 in the eq(1), we get that

Hence, there are 16 vans and 36 buses and Option 'c' is correct.