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A vessel is full of a mixture of kerosene and petrol in which there is 20% kerosene. 5 litres are drawn off and then the vessel is filled with petrol. If the kerosene is now 15%, how much does the vessel hold?1). 30 litres2). 35 litres3). 26 litres4). 32 litres |
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Answer» Let the total CAPACITY of VESSEL be x litres Kerosene in the vessel = 20x/100 Kerosene after 5 litres are drawn = 15x/100 Kerosene in 5 litres of mixture = (20 × 5)/100 ⇒ 20x/100 – (20 × 5)/100 = 15x/100 ⇒ 20x – 100 = 15x ⇒ 5x = 100 ⇒ x = 20 Thus, Vessel holds 20 litres of kerosene |
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