一題 GMAT-data sufficiency

Q1:Color X ink is created by blending red ,blue, green, and yellow inks in the ratio 6:5:2:2 What is the number of liters of green ink that was used to create a certain batch of color X ink?

條件1:The amount of red ink used to create the batch is 2 liters more than the amount of blue ink used to create the batch.

條件2: The batch consists of 30 liters of color X ink.

答案是 條件1及條件2各單獨成立

我有問題的是條件1:題目是求green ink

條件1,只給 red 跟 blue 為什麼能成立呀

請教教我謝謝

1 Answer

Rating
  • 1 decade ago
    Best Answer

    題目是:

    要混成X顏色的墨水,紅藍綠黃的比例是6:5:2:2

    也就是說,要用6份的紅+5份的藍+2份的綠+2份的黃

    假設每一份是Y公升

    則:6份紅比5份藍多了2公升

    亦即:6Y-5Y=2公升

    Y=2公升

    那麼,What is the number of liters of green ink that was used to create a certain batch of color X ink?

    答案就是4公升囉~

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