Biết 30% của một bao gạo là 15 kg gạo . Hỏi 80% lượng gạo đó nặng bao nhiêu kg gạo ?
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19 tháng 11 2020
Khối lượng của 30 bao gạo tẻ là:
30 x 40 = 1200 ( kg )
Khối lượng của 40 bao gạo nếp là:
40 x 20 = 800 ( kg )
Đổi : 1200 kg = 1,2 tấn
800 kg = 0,8 tấn
Xe đó chở được số tấn gạo là:
1,2 + 0,8 = 2 ( tấn )
Đáp số : 2 tấn gạo
8 tháng 10 2022
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31 tháng 1 2016
Số kg gạo tẻ là:
30.40=1200 (kg)
Số gạo nếp là:
40.20=800 (kg)
Xe chở số tấn gạo là:
800+1200=2000(kg)
2000 kg=2 tấn
Đáp số : 2 tấn
HP
8 tháng 10 2021
Số kg gạo là:
50 x 30 = 1500 (kg)
Số kg ngô là:
60 x 40 = 2400 (kg)
Xe ô tô chở số gạo và ngô là:
1500 + 2400 = 3900 (kg)
Đ/s: 3900 ki - lô - gam
22 tháng 2 2020
Gọi khối lượng bao gạo nếp là a, bao gạo tẻ là b (kg)
Ta có: a+b = 100
a - 2/3b = 15
=> (a+b) - (a-2/3b) = 5/3b = 100-15 = 85
=> b = 85 : 5/3 = 51
=> a = 100-51 = 49
Vậy ...
DB
4
PM
5
YK
5 tháng 5 2016
Bao gạo đó nặng:
10 : 1/4 = 40 (kg)
2/4 bao gạo cân nặng:
40 x 2/5 = 16 (kg)
Đáp số: 16 kg
80% lượng gạo đó nặng số kg là:
15:30x80=40(kg)
Đáp số:........................
100% của bao gạo đó là:
15 : 30 x 100 = 50 ( kg gạo )
80% lượng gạo đó là:
50 : 100 x 80 = 40 ( kg gạo )
Đáp số: 40 kg gạo