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lần1:lấy cân 2đĩa đặt môt bên 9k bên kia 8kg
lần 2:lấy 8kg đặt mỗi bên 4kg,rôì lấy 3,5kg+4kg=7,5kg
Ít nhất cũng phải mất 3 lầ cân
Lần thứ nhất: đặt quả cân lên đĩa và chia số bột mỳ sang hai bên đĩa cân sao cho cân thăng bằng thì bên có quả cân là 8 kg và bên không có quả cân là 9 kg
Lần thứ hai: Lấy 8 kg chia sang hai bên đĩa cân sao cho cân thăng bằng thì bên đĩa cân có quả cân là 3,5 kg bêb không có quả cân là 4,5 kg
Nếu giảm từ 62 500 xuống 50 000 thì đã giảm 1,25 lần
Nếu giảm từ 50 000 xuống 40 000 thì đã giảm 1,25 lần
Nếu giảm từ 40 000 xuống 32 000 thì đã giảm 1,25 lần
Nếu giảm từ 32 000 xuống số ? thì đã giảm 1,25 lần
Gọi số tiền cô chủ bán là x
Ta có: 32 000 : x = 1,25
x = 32 000 : 1,25
x = 25 600
Cô chủ đã bán với giá 25 600đ
Vì số đinh 10 cm đã bán gấp 3 lần số đinh 5 cm đã bán
=> Tổng số đinh đã bán gấp 4 lần số đinh 5 cm đã bán
ta có tổng số đinh bằng 24 + 26 + 30 + 37 + 41 + 55 + 58 = 271 chia cho 4 dư 3
=> Số thùng đinh còn lại phải là số kg chia cho 4 dư 3 . Trong các thùng đó có thùng 55 kg
vậy thùng đinh 10 cm còn lại là thùng 55 kg
Tổng số kg 6 thùng đã bán là 271 - 55 = 216 kg
Số kg thùng 5 cm là 216 : 4 = 54 kg = 24 + 30
Số kg thùng 10 cm là 271 - 54 = 217 kg
ĐS:...
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