Mathematics knowledge points of primary school level 456
The number of plants in the fourth and fifth grades is 240× (1-5/12) =140.
Grade 4 = 140÷(3+4)×3=60 strains.
I hope I can help you. @ Math Tutoring Group # I wish you progress in your study. Please ask questions if you don't understand, and adopt them in time if you understand! (*^__^*)