Soal SMA · Soal cerita · Kesulitan 4/5

A solution is 20% acid. How many liters of pure acid must be added to 10 L of this solution to make it 50% acid?

A.6 L
B.5 L
C.4 L
D.3 L

Kunci jawaban & pembahasan

Jawaban: 6 L

Let x be liters of pure acid. Acid amount: 0.2×10 + x = 0.5(10+x) ⇒ 2+x=5+0.5x ⇒ 0.5x=3 ⇒ x=6.

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