1.

1). 5/42). 5/23). 3/44). 4/3

Answer»

LET x LITERS of pure ALCOHOL added to mixture

⇒ Quantity of alcohol in 10 liters of mixture = 15% of 10 = 1.5 litre

⇒ (10 + x) x 25% = (1.5 + x)

⇒ 2.5 + 0.25x = 1.5 + x

⇒ 1 = 0.75x

∴ x = 4/3



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