A fish tank holds 20 litres when full. It is currently 3/4 full. How much more water is needed to fill it completely?
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Worked Solution
Step 1: Volume when full = 20 litres.
Step 2: Current volume = 3/4 × 20 = 15 litres.
Step 3: More water needed = 20 − 15 = 5 litres.
Correct answer: 5 litres
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