Percentage Practice Test 4 with solutions

Question : 8 of 40

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An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty it was filled with B type petrol. Again when the tank was half empty, it was filled with A type petrol. When the tank was half empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank?

50%
40%
37.5%
33.5%

Validate

Solution:

Let the capacity of the fuel tank = 100 litres
When Ist time B type petrol was filled then A and B types petrol were 50 litre each.
Again when A type petrol was filled in half empty tank then A type and B type were 75 litres and 25 litres respectively.
Hence, their ratio were 3 : 1
Again, when tank was half empty, then
Amount of A type petrol =

3/{3+ 1}×50

= 37.5 litres
& Amount of B type petrol =

1/4 × 50

= 12.5 litres
Then tank was filled with B type petrol in half empty tank.
Since, Amount of B type petrol = 12.5 + 50 = 62.5 litres
Hence, percentage of A type petrol at present in the tank is 37.5%.

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