🎀My excellent classmates (Help with my homework!)

40 pears are divided into 3 classes, 20 pears are divided into 1 class, and the rest are evenly divided into 2 classes and 3 classes, and 2 classes are divided into ()

Hi, can you help me with my homework? I will paste my homework or take a homework photo for you.

Hi, could you analyze the value 3*10^8 m/s？