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  1. In what ratio must 25% hydrochloric acid be mixed with 60% hydrochloric acid to get a mixture of 40% hydrochloric acid ?
    1. 5 : 12
    2. 4 : 3
    3. 3 : 4
    4. 12 : 5
Correct Option: C

By alligation,

∴ Required ratio = 15 : 20 = 3 : 4


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