số gạo tẻ nhiều hơn số gạo nếp số bao là:21-18=3(bao)

mỗi bao có số kg gạo là:45:3=15(kg)

bán được số kg gạo tẻ là:15*21=315(kg)

bán được số kg gạo nếp là:315-45=270(kg)

cả ngày bán được số kg gạo là:315+270=585(kg)

Đ/S:585 kg

Bao thứ nhất:64

bao thứ hai:16

Bao thứ nhất nặng : 80 kg

Bao thứ hai cận nặng : 0 kg

tổng số phần 2 bao gạo :4+1=5phần

baogạo 1:80/5*4=64kg

bao gạo 2:80/5=16kg 

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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Xe đó chở số tấn gạo là:

(30×40)+(40×20)=2000(kg)=2(tấn)

                              Đáp số: 2 tấn

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

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

tổng số ki-lô-gam gạo của 30 bao gạo là:

30x50=1500(kg)

tổng số ki-lô-gam gạo của 40 bao ngô là:

40x60=2400(kg)

xe ô tô đó chở tất cả số ki-lô-gam gạo và ngô là

2400+1500=3900(kg)

Rễ 😏

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 ...

3/4 bao gạo nặng là

( 15 : 30%) x 3/4 = 37,5 (kg)

1 bao gạo có số kg là:

15 : 30 = 0,5(kg)

3/4 tương đương số phần trăm là:

100 : 4 nhân 3 = 75 (%)

3/4 bao gạo nặng số kg là:

0,5 nhân 75 = 37,5(kg)

3/4 bao gạo nặng số kg  là:

   ( 15 : 30x 100 ) x 3/4 = 37,5 (kg)

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

10 : 1 x 4 = 40 kg 

40 : 5 x 2 = 16 kg   

Đáp số : 16 kg

à mình gõ lộn 2/5 bao gạo nhé :P