1.

In what ratio should 20% ethanol solution be mixed with 40% ethanol solution to obtain a 28% ethanol solution?1). 2 ∶ 32). 8 ∶ 53). 3 ∶ 24). 5 ∶ 8

Answer»

Let the ratio of 20% ethanol to 40% ethanol be X ? 1,

According to the QUESTION,

⇒ x × 0.2 + 1 × 0.4 = (x + 1) × 0.28

⇒ 0.08x = 0.12

⇒ x = 3/2

REQUIRED Ratio = 3 ? 2


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