"Maruyama-kun, is this question correct?" Aito moved his notes to the side.
Junan, who was not asleep, glanced at him for a moment. His hand took over the pen held by Aito, underlining the wrong part.
"First, find the easiest oxidation number for H3PO4. H has a value of +1 and O has a value of -2. Don't look for the P value right away. But, multiply H and O by the variable number first. H has 3 means +3, while -2 x 4 = -8. Then find the P value." The big hand looked rough and full of scars, but the way he wrote the pen looked careful, neat, and graceful.
Aito saw the straight and sharp writing, very pleasing to the eye. While the writing was small and round, making it difficult for people to read it. However, Junan didn't seem to have any trouble at all. The firm and slow voice filled his ears until it felt hot.
