Answer:450
Step-by-step explanation: If you add 150 to 150 that will give you 300.If you add 300 to 100 that will give you 400.Finally if you add 400 to 50 that will give you 450.
Your answer is: 450 students
25 questions
Explanation: 20 divided by 25 is .8 which is 80%
In order to get the answer to this question you will have to use PEMDAS and solve.

Using PEMDAS:










Therefore your answer is "-103."
Hope this helps.