A petrol tank that is 1/2 full has 8 gallons petrol removed. The tank is then 1/10 full. What is the capacity, in gallons, of the tank?

A petrol tank that is 1/2 full has 8 gallons petrol removed. The tank is then 1/10 full. What is the capacity, in gallons, of the tank? Correct Answer 20

Petrol removal = 1/2 - 1/10 = 2/5 2/5 of capacity = 8 gallons So,  full capacity = 8 x 5 / 2 =  20 gallons
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