“Let's not rush ...”
The boy cleaned the blackboard because he felt something was wrong.
"Let's think a little," the professor told Johnny. “A quarter less than the quantity of a quarter of a cup it means ...”
The boy wrote again on the blackboard.
¼ - ¼ = 0
Again the same mistake, so the professor stood up and started writing on the blackboard.
¼ - flying chestnut tea
1- ¼ - water from dragon scales
The professor gave Johnny the magic chalk.
“And the same amount of basilisk glue.”
But Johnny was so confused, that he was about to cry.
"I don't understand why we should learn such calculations," he sighed.
“Because we need maths all the time. For potions, for example,” Knudlac again showed Johnny the geranium that was quiet and calm.
“I'm not interested in potions,” the boy defe
