Question

One person can drink 4.5 litres of water in a day. How many millilitres of water can he drink in 15 days?
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Answer 1

Total number of days $=15$
Water he can drink in 1 day $=4.5l$

Total water that he can drink in 15 days $=15\times 4.5l=67.5l$
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Also, $1l=1000ml$

$\Rightarrow 67.5l=67.5$ $\times$ 1000 ml = 67500 ml
Thus, he can drink 67500 millilitres of water in 15 days.
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