a) 17
b) 18
c) 20
d) 22
Answer: c
Explanation: Let the number of puffs,
$$3x \times \left( {3 \times \frac{1}{{150}}} \right) + \left( {13 \times 60 – 3x} \right) \times \frac{1}{{150}} = 6$$
So, x = 20 puffs.
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