MOT TRUONG THCS CO 1200HS . TRONG DO SO HS KHOI 6 CHIEM 28PHAN TRAM, SO HS KHOI 7 BANG 27/28SO HS KHOI 6 . SO HS KHOI 9 BANG 4/5 4/5 SO HS KHOI 8

TINH SO HS MOI KHOI 

TI LE SO HS KHOI 8 VOI SO HS TOAN TRUONG LA BAO NHIEU

Cuoi nam 2010-1011,khoi 5 cua mot truong tieu hoc co so hsg chiem ty le 40% so voi hs ca khoi. so hoc sinh kha chiem 36 %

so hoc sinh ca khoi,so hoc sinh trung binh chiem 1/5 so hoc sinh ca khoi ,con  lai la 1 em chua hoan thanh chuong trinh tieu hoc .hoi hoc sinh khoi 5 truong do co tat ca bao nhieu hs

Nho cac ban giup minh

khoi nam cua truong co 120 hs trong do co 72 hs la nu hoi so hs nu cua khoi nam chiem bao nhieu phan tram tong so hs cua ca khoi

so hs khoi 6 cua truong co nhieu hon 250 va it hon 400 hoc sinh .neu so hs xep thanh hoang 18,24 deu du 2 em. hoi so hs khoi 6 la bao nhieu ba, biet rang so hs khoi 6 la boi cua 5

1.hs khoi 6 cua 1 truong lam bai kiem tra chat luong mon toan .ket qua chi co nhu sau:trung binh la 50% tong so bai.trong so cac bai con lai kha chiem \(\frac{4}{8}\)va gioi la 20 bai.hoi nha truong co bao nhieu hoc sinh khoi 6

1 truong tieu hoc co 800 hs. so hs gioi chiem 13,5% so hs toan truong, so hoc sinh trung binh va yeu la 476 em, con lai la hs tien tien. hoi:

a) truong do co bao nhieu hs dat danh hieu hs gioi?

b) so hs tien tien chiem bao nhieu phan tram so hs toan truong?

3/ tim so hoc sinh khoi 6 cua 1 truong thcs. biet so hs nu chiem \(\frac{3}{5}\) so hs khoi 6 cua truong la 162 em

khoi 5 cua truong co 120hs trong do co 72 bn la nu hoi so hs nu cua khoi lop 5 chiem % pt tong so hs cua ca khoi

khoi lop 5 cua truong tan  tien co 3 lop . so hs cua lop 5a bang 3/8 so hs cua khoi , so hs cua lop 5b bang 2/3 so hs cua loi 5a , lop 5c co 45 hs. khoi lop 5 cua truong tan tien co bao nhieu hoc sinh