1 nguoi tho moc lam xong 1 cai ghe het 2 gio 12 phut ,lam xong 1 cai ban het 3 gio 15 phut .hoi nguoi lam 3 cai ghe va 2 cai ban thi het bao nhieu thoi gian ?

mot nguoi tho moc lam xong 1 cai ghe het 2 gio 12 phut, lam xong 1 cai ban het 3 gio 15 phut. hoi nguoi do lam 3 cai ghe va 2 cai ban thi het bao nhieu thoi gian

bac tho moc lam 1 bo ban ghe gom 1 cai ban va 4 cai ghe het 16 gio 30 phut. hoi trung binh lam 1 cai ghe het bao nhie thoi gian . biet thoi gian lam mot cai ban banh thoi gian lam 2 cai ghe.

Bav tho moc Lam mot cai ban va 4 cai ghe het 16 gio 30 phut . Hoi trung binh lam mot cai ghe mat bao nhieu thoi gian. Biet rang thoi gian lam mot cai ban bang thoi gian 2 cai ghe

tho moc lam 1 cai ban va 4 cai ghe het 16h30' tim trung binh thoi gian lam 1 cai ghe het bao nhieu thoi gian biet thoi gian lam mot cai ban bang thoi gian lam 2 cai ghe.

ban tho moc sua 3 cai ban bac sua cai ban thu nhat het 1 gio 20 phut cai ban thu hai bac sua nhanh hon nua gio bac sua cai ban thu ba lau hon muoi phut hoi bac da sua het bao nhieu thoi gian?

nha truong da mua mot so  ghe moi thang gia 250000d va mot so ban moi cai gia 400000d het tat ca 3100000d neu nha truong mua so ban dung bang so ghe da mua va mua so ghe dung bang so ghe da mua va mua so ghe dung bang so ban da mua thi phai tra them 300000d nua hoi nha truong mua may cai ban va may cai ghe 

nha truong da mua 1 so ghe va 1so ban. 1cai ghe gia 250000 dong,1 cai ban gia 400000 dong,het tat ca 3100000 dong.neu nha truong mua so ghe bang dung so ban va mua so ban bang dung so ghe da mua thi phai tra them 300000 dong.hoi nha truong mua may cai ban may cai ghe?

16 nguoi tho moc sua 30 cai ghe het 2 gio .hoi 8 nguoi tho sua trong 8 gio thi duoc bao nhieu cai ghe

            minh can gap