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牛乳対コーヒー牛乳=3対8
牛乳は3、コーヒーは5、コーヒー牛乳は3+5=8

15人×160ml=2400ml 3対8=X対2400
8X=2400×3
X= 2400×3÷8
X=300×3
           X=900
  必要な牛乳の量は900mlは必要

小西行長

コーヒー牛乳は2400ml
3対8=牛乳(X)対コーヒー牛乳(2400ml)

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