Mathematics
NULL
Medium
Question
How much water should be added to 9 ml of 50% alcohol lotion to make it 30% alcohol?
A
3 ml
B
4 ml
C
5 ml
D
6 ml
✓ Official correct answer
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A
3 ml
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B
4 ml
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C
5 ml
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D
6 ml
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Explanation
Alcohol = 4.5 ml. 4.5 = 0.3(9 + w) ⇒ w = 6 ml.