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A tank is 1/3 full. After 20 litres are added it is 1/2 full. What is the capacity of the tank?

A60 litres
B80 litres
C100 litres
D120 litres
Answer & Solution
Correct answer: D. 120 litres
1/2 minus 1/3 is 1/6 of the tank, which is 20 litres, so the full tank is 120 litres.
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