英文GRAMMA問題

Your tense is not wrong but I think that you should change it to

present is more better!!!



"70% of students believed that current transports provided were

insufficient but others disagreed with this point."

OR ,

"70% of students believe that current transports provided are

insufficient but others disagreed with this point."

Hope I can help you!!! ^_^

Your grammar is correct, because it is a report telling information you have reseached, therefore u should use past tense.
Using past or present tense is depended on what your sentence is about, but in a report, usually written in past tense.