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H24
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H24
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YS
27 tháng 12 2018 lúc 9:44

Mỗi lớp có số em là: 112 : 4 = 28 ( em )

Khối 5 có số học sinh nam là: 112 : 7 . 3 = 48 ( em )

Khối 5 có số học sinh nữ là: 112 - 48 = 64 ( em )

Còn chỗ nào chưa hiểu, cứ hỏi :)

Hk tốt

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H24
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H24
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H24
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H24
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TC
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H24
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TH
11 tháng 7 2016 lúc 13:39

Theo bài ra, ta có:  2/5 nam và 4/7 nữ là 140 bạn hay số bạn nam và 10/7 số bạn nữ là 350 ; và 5/6 nam nhiều hơn 9/14 nữ là 35 bạn hay số bạn nam nhiều hơn 27/35 số bạn nữ là 42 bạn.

 Do đó: (10/7 +27/35)số bạn nữ  = 11/5 số bạn nữ bằng:

                     350 - 42 = 308(bạn)

 Số bạn nữ là:

                 308:(11/5) = 140(bạn)

Số bạn nam là:

       350 - 140x(10/7)= 150(bạn)

   Đáp số: nam: 150 bạn

                 nữ: 140 bạn

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HR
11 tháng 7 2016 lúc 13:39

\(‼¶§☺⌂åæ¢\)

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H24
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LH
11 tháng 7 2016 lúc 13:18

Mình không nghĩ ra nên bạn tham khảo nhé :

Nguồn : http://gdthhatinh.violet.vn/

Theo bài ra \(\frac{2}{5}\)số gà ít hơn \(\frac{2}{3}\)số vịt là 200 con

Vậy,  \(\frac{6}{5}\)số gà ít hơn 2 lần số vịt là:

200 x 3 = 600 (con)

Hay \(\frac{3}{5}\)số gà ít hơn vịt là

600 : 2 = 300 con (1)

Mặt khác, \(\frac{3}{4}\)số gà nhiều hơn  \(\frac{5}{12}\)số vịt là 125 con

Nên 9 lần số gà nhiều hơn 5 lần số vịt là:

125 x 12 = 1500 (con)

Hay \(\frac{9}{5}\)số gà nhiều hơn số vịt là:

1500 : 5 = 300 con (2)

Từ (1) và (2) ta có:

\(\frac{9}{5}\)số gà nhiều hơn \(\frac{3}{5}\)số gà số con là

300 + 300 = 600 (con)

Phân số chỉ số phần của 600 con gà là:

 \(\frac{9}{5}-\frac{3}{5}=\frac{6}{5}\)

Số gà là:

600 x 5 : 6 = 500 (con)

Số vịt là:

3 x 500:5 + 300 = 600 (con)

Đáp số: 500 con gà

            600 con vịt

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CD
26 tháng 2 2017 lúc 20:05

500 con gà 

600con vịt 

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