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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
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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
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 ...
30 bao ngô nặng : 30 x 60 =1800 (kg)
25 bao gạo nặng: 25 x 50=1250 (kg)
xe đó chở được : 1800+1250=3050kg = 3,05( tấn)
Bài giải
70 bao gạo cân nặng số kg là :
50 x 70 = 3500 ( kg )
Số kg gạo ngày thứ nhất bán được là :
3500 x 30 : 100 = 1050 ( kg )
Số kg gạo ngày thứ hai bán được là :
3500 x 45 : 100 = 1575 ( kg )
a) Số kg gạo bán trong 2 ngày là :
1050 + 1575 = 2625 ( kg )
b) Số kg gạo còn lại sau 2 ngày bán là :
3500 - 2625 = 875 ( kg )
Lượng gạo trong bao là:
20:5/6=24(kg)
3/4 lượng gạo trong bao là:
24x3/4=18(kg)
Sau khi lấy 3/4 số gạo thì trong bao còn lại là:
24-18=6(kg)
Đáp số: 6kg
Số lượng gạo trong bao là:
\(20:\frac{5}{6}=24\left(kg\right)\)
\(\frac{3}{4}\)lượng gạo trong bao là:
\(24x\frac{3}{4}=18\left(kg\right)\)
Số gạo còn lại trong bao là:
\(24-18=6\left(kg\right)\)
Đáp số:6kg
Bao gạo đó nặng là: \(75,6:65\times100=116,3\left(kg\right)\)(Đã làm tròn)
5/6 bao gạo nặng là: \(116,3\times\frac{5}{6}=96,91\left(kg\right)\)(..)
Đ/s:..
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