Question : In what ratio must 25% hydrochloric acid be mixed with 60% hydrochloric acid to get a mixture of 40% hydrochloric acid?
Option 1: 5 : 12
Option 2: 4 : 3
Option 3: 3 : 4
Option 4: 12 : 5
Correct Answer: 4 : 3
Solution : Using the alligation method, we get, Required ratio = (Higher value – Mean value) : (Mean value – Lower value) $\therefore$ Required ratio = (60 – 40) : (40 – 25) = 20 : 15 = 4 : 3 Hence, the correct answer is 4 : 3.
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