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Filling the injection twice let Tariq mark:

A40 mL
B10 mL
C20 mL
D30 mL
Answer & Solution
Correct answer: B. 10 mL
1. Each filling of the injection was 5 mL. 2. Two fillings make 5 plus 5, which is 10. 3. So he marked 10 mL on his bottle. _Source: syllabus Mathematics, 'Math-Magic', Ch 14 'How Big? How Heavy?'_
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