You can't tell from that. If he received a 90 in all classes but one, where he got a 91, then his GPA would be 4.0. If half of his classes were high "B"s and the rest "A"s he would have a 3.5 and, of course, if he had 89's in all of his classes but one where he scored at or near 100, he would have a GPA in the low 3's.

You really need to find what he scored in each class to figure his GPA correctly.

You really need to find what he scored in each class to figure his GPA correctly.