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1. |
In a mixture of 80 litres of petrol and ethanol, 25% of the mixture is petrol. How much ethanol should be added to the mixture so that petrol becomes 20% of the mixture? |
A. | 25 litres |
B. | 15 litres |
C. | 30 litres |
D. | 20 litres |
Answer» E. | |