please help me solve B its Algebra

Step-by-step explanation:
As, The teacher want to add 10 additional students
So, 25 + 10 = 35
35 students will be there
So, now we will first change the charge per student
So, for 1 student = $1
Now, in total the charge for the museum itself = $35
So, for not exceeding $150, $35 is already done
So, $150 - $35 = $115
So, for bus = $115
And charge per student =$1