bao tẻ nặng : 66 kg

bao nếp :25kg

Làm dạng tổng hiệu

GẠO TẺ: 91+41:2 =66(kg)

Gạo nếp: 91-66=25 (kg)

                                                        Tổng số kg gạo nếp và gạo tẻ trong kho là:

                                                                   55x(125+75)= 11000(kg)

                                                             Lượng gạo còn lại trong kho là:

                                                                  11000:4=2750(kg)

                                                          Số kg gạo nếp và gạo tẻ đã chuyển đi là:

                                                                11000 - 2750= 8250(kg)

                                                                             Đáp số: 8250kg

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 ...

Ta có sơ đồ:

Bao gạo nếp 5 phần

Bao gạo tẻ 8 phần

Sơ đồ cho ta thấy số gạo tẻ là:

15÷(8-5)×8=40(kg)

Số gạo nếp là:

40-15=25(kg)

Số kg gạo tẻ là:

50 x 32 = 1600 (kg)

Số kg gạo nếp là:

59 x 45 = 2655 (kg)

Vậy có tổng cộng:

1600 + 2655 = 4255(kg) = 4,255 tấn

ĐS: 4,255 tấn

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

mình chỉ biết câu 1 thôi : 

lấy số bao gạo tẻ nhân với cân nặng của bao là 30 x 40 = 1200 kg.

sau đó ta cũng làm như cách kia là : 40 x 20 = 800 kg.

ta cộng 2 tích lại bằng : 1200 + 800 = 2000 kg

1. 

30 bao gạo tẻ nặng số ki-lô-gam là : 

40 x 30 = 1200 (kg)

40 bao gạo nếp nặng số ki-lô-gam là : 

20 x 40 = 800 (kg)

Xe đó chở số gạo là :

1200 + 800 = 2000  (kg)

2000kg = 2 tấn

Đáp số : 2 tấn

2.

1 tạ 50kg = 150 kg

Sau khi bán đi 25kg mỗi loại thì hiệu số gạo vẫn không đổi .

Lúc đầu cửa hàng có số gạo tẻ là :

150 : (5-2) x 5 = 250 (kg)

Lúc đầu cửa hàng có số gạo nếp là :

250 - 150 = 100 (kg)

Đáp số : 250kg gạo tẻ

               100kg gạo nếp

3.

a, \(\frac{41}{24}\)

b, \(\frac{194}{65}\)

Bài 3 mình ko chắc lắm.