Answer: 56 seats
Explanation:
Question should say 856 students not 156 students.
If there are 856 students and 700 guests, the total number of people coming for the event is:
= 856 + 700
= 1,556 people
There are 1,500 seats so the extra seats needed are:
=Number of people coming - Seats available
= 1,556 - 1,500
= 56 seats
If the question is indeed 156 students then there is no need for extra seats as the total number of people coming would be: 156 + 700 = 856. Seats would be surplus.