Biết 30% của một bao gạo là 15 kg gạo . Hỏi 80% lượng gạo đó nặng bao nhiêu kg gạo ?
Trong một ngày , một cửa hàng bán được 21 bao gạo tẻ và 18 bao gạo nếp . Biết rằng lượng gạo nếp bán được ít hơn lượng gạo tẻ là 45 kg . Hỏi trong cả ngày hôm đó cửa hàng bán được bao nhiêu kg gạo , biết rằng mỗi bao gạo cân nặng như nhau ?
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
Một xe tải chở 30 bao gạo tẻ và 40 bao gạo nếp.Mỗi bao gạo tẻ cân nặng 40 kg , mỗi bao gạo nếp cân nặng 20 kg . Hỏi xe đó chở bao nhiêu tấn gạo ?
Hai bao gạo cân nặng 80 kg, biết rằng bao gạo thứ nhất gấp 4 lần bao gạo thứ 2. Hỏi mỗi bao nặng bao nhiêu kg gạo?
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
Một xe tải chở 30 bao gạo tẻ và 40 bao gạo nếp. Mỗi bao gạo tẻ cân nặng 40 kg, mỗi bao gạo nếp cân nặng 20 kg. Hỏi xe đó chở bao nhiêu tấn gạo ?
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
Một xe tải chở 30 bao gạo tẻ và 40 bao bao gạo nếp .Mỗi bao gạo tẻ cân nặng 40 kg , mỗi bao gạo nếp cân nặng 20 kg . Hỏi xe đó chở bao nhiêu tấn gạo ?
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
Một ô tô chở 30 bao gạo và 40 bao ngô. Biết rằng mỗi bao gạo nặng 50 kg, mỗi bao ngô nặng 60 kg. Hỏi xe ô tô đó chở tất cả bao nhiêu ki-lô-gam gạo và ngô?
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)
Bao gạo nếp và bao gạo te nặng tất cả 100kg.Khối lượng bao gạo nếp hơn 2/3 khối lượng bao gạo tẻ là 15 kg. Hỏi mỗi bao nặng bao nhiêu kg gạo?
mình đang cần gấp. Cảm ơn các bạn
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 ...
biết 30% của 1 bao gạo là 15kg .Hỏi 3/4 bao gạo nặng bao nhiêu kg?
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)
Biết 1/4 của một bao gạo cân nặng 10 kg. Hỏi 2/5 của bao gạo đó cân nặng bao nhiêu 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