Respuesta :

20% is the answer

Hope this helps

Answer:

30 Students

Step-by-step explanation:

Suppose there are a total of 150. If you have 80% adding all the other subjects then 100% - 80% is 20%

20/100 =  ?/150 cross multiply

150*20 is 3000

then 3000 divided by 100 is 30

There 30 is your answer!! Hope it helped (P.S sorry its 3 years late I just saw)