To find this number, let's represent the unknown amount of students with the variable x:
356 + 365 + x = 977
721 + x = 977
x = 256
There are 256 students in ninth grade.
Hello,Équation : 356 + 365 + x = 977→ 731 + x = 977→ x = 977 - 731 = ....Bye :)
