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Nilai rata-rata ulangan kelas A adalah x A ​ ​ dan kelas B adalah x B ​ ​ . Setelah kedua kelas digabung, nilai rata-ratanya menjadi x . Jika : = 10 : 9 dan = 85 : 81 . Maka perbandingan banyaknya siswa kelas A dan B adalah....

Nilai rata-rata ulangan kelas A adalah  dan kelas B adalah . Setelah kedua kelas digabung, nilai rata-ratanya menjadi . Jika stack x subscript A with bar on top  stack x subscript B with bar on top =  dan x with bar on topcolon stack x subscript B with bar on top = . Maka perbandingan banyaknya siswa kelas A dan B adalah....

  1. 8:9

  2. 4:5

  3. 3:4

  4. 3:5

  5. 9:10

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N. Indah

Master Teacher

Mahasiswa/Alumni Universitas Diponegoro

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Pembahasan

begin mathsize 12px style x with bar on top colon stack x subscript b with bar on top equals 85 colon 81 rightwards double arrow stack x subscript b with bar on top equals 81 over 85 x with bar on top stack x subscript a with bar on top colon stack x subscript b with bar on top equals 10 colon 9 rightwards double arrow stack x subscript a with bar on top equals 10 over 9 x with bar on top subscript b equals 10 over 9 colon 81 over 85 x with bar on top equals 18 over 17 81 over 85 x with bar on top  x with bar on top equals fraction numerator open parentheses stack x subscript a with bar on top cross times n subscript a close parentheses plus open parentheses stack x subscript b with bar on top cross times n subscript b close parentheses over denominator n subscript a plus n subscript b end fraction left right double arrow open parentheses n subscript a plus n subscript b close parentheses x with bar on top equals open parentheses stack x subscript a with bar on top cross times n subscript a close parentheses plus open parentheses stack x subscript b with bar on top cross times n subscript b close parentheses left right double arrow open parentheses x with bar on top cross times n subscript a close parentheses plus open parentheses x with bar on top cross times n subscript b close parentheses equals open parentheses stack x subscript a with bar on top cross times n subscript a close parentheses plus open parentheses stack x subscript b with bar on top cross times n subscript b close parentheses left right double arrow open parentheses x with bar on top cross times n subscript a close parentheses minus open parentheses stack x subscript a with bar on top cross times n subscript b close parentheses equals open parentheses stack x subscript b with bar on top cross times n subscript b close parentheses minus open parentheses x with bar on top cross times n subscript b close parentheses left right double arrow open parentheses x with bar on top minus stack x subscript a with bar on top close parentheses n subscript a equals open parentheses stack x subscript b with bar on top minus x with bar on top close parentheses n subscript b n subscript a over n subscript b equals fraction numerator stack x subscript b with bar on top minus x with bar on top over denominator x with bar on top minus stack x subscript a with bar on top end fraction equals fraction numerator 81 over 85 x with bar on top minus x with bar on top over denominator x with bar on top minus begin display style fraction numerator negative 1 over denominator 17 end fraction end style end fraction equals fraction numerator fraction numerator negative 4 over denominator 85 end fraction x with bar on top over denominator begin display style fraction numerator negative 1 over denominator 17 end fraction end style x with bar on top end fraction equals 4 over 5 end style

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