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%V = V zat terlarut/ V total larutan x 100%
25% = x / x + 150 x 100%
0,25 = x / x +150
0,25x + 37,5 = x
37,5 = 0,75 x
x = 50 mL
berarti untuk mendapatkan 25% larutan alkohol, berarti perlu ditambahkan 50 mL alkohol ke dalam 150 mL larutan :)
semoga bermanfaat :D