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Question

To fuel autorikshaws, petrol and oil are mixed in the ratio 40 : 1. How many liters of oil is needed with 5 liters of petrol? And with 1 liter of petrol?

 


Solution

Ratio of petrol to oil in the fuel = 40 : 1

∴ Ratio of oil to petrol in the fuel = 1 : 40

Quantity of petrol in the fuel = 5 litres

Quantity of oil needed for the fuel = × quantity of petrol in the fuel

= × 5 litres

= litre

= 0.125 litre

Thus, 0.125 litres of oil is needed with 5 litres of petrol.

If quantity of petrol in the fuel = 1 litre

Quantity of oil needed in the fuel = × 1 litre = litre = 0.025 litre

Thus, 0.025 litre of oil is needed with 1 litre of petrol.


Mathematics
Mathematics Part I
Standard VII

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