\(\star \) A bottle of my favourite drink contains \( 12 \% \) alcohol. On my doctors advice I added \( 20 ml \) water to the bottle to reduce the concentration to \( 10 \% . \) What was the quantity of drink in my bottle initially?
Pregunta
Answer
0.12x/(x+20) = 0.1
0.12x-0.1x = 2
0.02x = 2
x = 100ml
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