or
or
Let, amount of water that needs to be added i x
Amount of pure alcohol before the water is added = 0.40×30 = 12 ounces
Amount of pure alcohol before the water is added = 0.25 ×( 30 + x) ounces
According to question,
12 = o.25 ( 30 + x)
12 - 7.5 = o.25x
x = 18 ounces
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