According to ties study guidelines how many minutes of science reading should he do if it's science class is 90 minutes long 20 minutes for every 60 minutes of class time

You would have to have 20 minutes of studying per hour of class time. This means that 60 times 2=120. 120-90=30. 30 minutes is half an hour. So you would do 20 divided by 2 since u are adding another half hour to studying. You would add 60 and 10 to get 70 as your answer I think. I hope this helps and is correct :)

I’m not sure i’m sorry