Soal SMA · Soal cerita · Kesulitan 3/5

A solution contains 30% alcohol. How many liters of pure alcohol must be added to 10 liters of this solution to make it 50% alcohol?

Kunci jawaban & pembahasan

Jawaban: 4

Let x be liters of pure alcohol. (3 + x)/(10+x)=0.5 ⇒ 3+x=5+0.5x ⇒ 0.5x=2 ⇒ x=4.

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