Meng Chuyuan's gaze fell on the textbook on the desk and her brows furrowed a little. Upon seeing this, Lu Qianling gloated at the side. "You don't understand it, do you?"
Meng Chuyuan reached out and pointed at the calculation process she had written in the book. She reminded her, "You didn't find the right solution."
"Duh. If I could find it, why would I be here worrying?"
Meng Chuyuan picked up a pen and wrote a formula for Lu Qianling, then handed the pen to her. "Try it."
Lu Qianling took the pen in confusion. She did not have any high hopes for Meng Chuyuan. She lowered her head perfunctorily and glanced at the formula Meng Chuyuan had just written.
After reading the new line of texts in the textbook, Lu Qianling's eyes suddenly widened.
She blinked in astonishment and said excitedly, "I know this! I've learned this before."
"If you've learned it before, why don't you use it?"
